Self-bearing structural member based on longitudinal bearing framework of retired wind power blade

Abstract

The invention discloses a self-bearing structural member based on a longitudinal bearing framework of a retired wind power blade. The structural member is formed by segmenting an out-of-service wind power blade and comprises a composite shell unit composed of a blade shell and a longitudinal bearing framework located in the shell unit and continuously arranged in the axial direction, and the longitudinal bearing framework at least comprises a spar cap and a shear web. The longitudinal bearing framework and the shell unit form a collaborative stress system through an original composite material structure connection interface of the wind power blade, so that a structural component achieves self-bearing under the condition that no external bearing frame exists. On the premise that the continuity of a main bearing path of the longitudinal bearing framework is kept, selective local structure treatment is carried out on the shear web, and the engineering adaptability of a structural component is improved under the condition that the overall stress performance is not weakened. According to the method, the original bearing structure of the retired wind power blade is fully utilized, and a feasible engineering technical scheme is provided for structured and high-value reutilization of the retired wind power blade.

Description

Technical Field

[0001] This invention relates to the field of structured reuse and remanufacturing of engineering components for decommissioned wind power equipment, specifically to a self-supporting structural component based on the longitudinal load-bearing frame of decommissioned wind turbine blades. Background Technology

[0002] Wind turbine blades are typically made of glass fiber reinforced composite materials or carbon fiber reinforced composite materials, and are usually used as large cantilever beam components during service. To meet the requirements of complex load conditions during operation, wind turbine blades have a longitudinal load-bearing frame consisting of a spar cap and a shear web, which is used to bear the main bending moment, shear force and axial load.

[0003] With the large-scale decommissioning of wind power equipment, the disposal of wind turbine blades has become an increasingly prominent issue. Existing treatment methods mainly involve crushing, pyrolysis, or downgrading and recycling. These methods typically damage the continuous fibers and original load-bearing structure in composite materials, making it difficult to effectively preserve the engineering value of the materials.

[0004] A few technical solutions attempt to use retired wind turbine blades directly as engineering components after cutting them up. However, these solutions often disrupt the continuity of the longitudinal load-bearing frame inside the blade during the cutting process, making it difficult for the cut components to bear loads independently. They need to rely on external steel trusses, concrete frames, or other load-bearing systems for support, thereby increasing the complexity of the project and the implementation cost.

[0005] Furthermore, while the internal longitudinal load-bearing frame of a wind turbine blade bears structural functions, it also affects the engineering adaptability of the component. Simply retaining the internal shear web structure completely may limit the space utilization and functional layout of the component in engineering applications; completely removing the shear web structure will weaken the overall stiffness and stability of the component. Therefore, how to enable the segmented structural components to achieve self-support while maintaining the continuity of the overall force path of the longitudinal load-bearing frame and taking into account engineering adaptability has become an urgent technical problem to be solved in the field of structural reuse of decommissioned wind turbine blades. Summary of the Invention

[0006] The purpose of this invention is to provide a self-supporting structural component based on the longitudinal load-bearing frame of a retired wind turbine blade. By reasonably retaining and utilizing the original longitudinal load-bearing frame of the wind turbine blade, the structural component formed by cutting the retired wind turbine blade achieves self-support without an external load-bearing frame. Furthermore, by performing local structural treatment on the sheared web when necessary, a balance is achieved between structural load-bearing capacity and engineering adaptability, thereby solving the problem in the prior art where it is difficult to balance structural performance and engineering applicability during the reuse of retired wind turbine blades.

[0007] To achieve the above objectives, the present invention provides a self-supporting structural component based on the longitudinal load-bearing frame of a retired wind turbine blade. The structural component is obtained by cutting up a retired wind turbine blade and includes a shell unit and a longitudinal load-bearing frame.

[0008] The shell unit is a composite material shell structure consisting of a portion of the outer shell of a decommissioned wind turbine blade. The longitudinal load-bearing frame is located inside the shell unit and is continuously arranged along the axial direction of the structural member. The longitudinal load-bearing frame is part of the original structure of the wind turbine blade and includes a spar cap and a shear web in at least a portion of the axial section.

[0009] The longitudinal load-bearing frame and the shell unit are connected as a whole through the original connection part (3) of the wind turbine blade, and form a co-force-bearing overall structural system so that the structural components can achieve self-supporting without an external load-bearing frame.

[0010] In some embodiments, the longitudinal load-bearing frame includes a pair of wing caps arranged continuously along the axial direction, and at least one shear web connecting the pair of wing caps.

[0011] In some embodiments, the longitudinal load-bearing frame and the shell unit jointly participate in the transmission of bending moment, shear force and / or axial force of the structural member, forming a shell-frame cooperative force-bearing system.

[0012] In some embodiments, during the process of dividing the structural member, local cutting or fiber damage to the edge region of the longitudinal load-bearing frame is permitted, but without causing the wing cap to be completely truncated along the axial direction, so as to maintain the continuity of the overall force path of the longitudinal load-bearing frame.

[0013] In some embodiments, the shear web is provided with at least one through opening while maintaining axial continuity, so as to release usable space inside the structural member without disrupting the overall force path continuity of the longitudinal load-bearing skeleton.

[0014] In other embodiments, the shear web is partially removed in the middle section of the structural member along the axial direction, or is discontinuously arranged in a local axial section, and the shear web structure is retained on both sides of the middle section to maintain the continuity of the overall force path of the longitudinal load-bearing skeleton.

[0015] In some embodiments, the structural member is a linear load-bearing structure or a shell-type load-bearing structure.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: Firstly, by retaining the original longitudinal load-bearing frame of the retired wind turbine blades and keeping it integrally connected with the shell unit, it is beneficial to form a self-supporting structural component and improve the structural efficiency of reusing retired blades. Secondly, by maintaining the continuity of the overall force path of the longitudinal load-bearing frame along the axial direction, the force characteristics of the structural components continue the original design logic of the wind turbine blades, which is conducive to improving structural safety and overall stability. Third, by making openings, partially removing or setting local discontinuities in the shear web, the engineering adaptability and space utilization of structural components can be improved without destroying the overall stress system. Fourth, it provides a structurally feasible and engineering-controllable technical path for the high-value transformation of retired wind turbine blades from waste into engineering structural components. Attached Figure Description

[0017] Figure 1 This is a typical cross-sectional structural diagram of the self-supporting structural component based on the longitudinal load-bearing frame of a retired wind turbine blade according to the present invention. The figure shows a composite material shell unit (1) formed by cutting a retired wind turbine blade, and a longitudinal load-bearing frame (2) disposed inside the composite material shell unit (1); the longitudinal load-bearing frame (2) includes at least a spar cap (21) and a shear web (22) connected to the spar cap (21), and is integrally connected to the composite material shell unit (1) through the original connection part (3) of the wind turbine blade.

[0018] Figure 2 This is a schematic diagram illustrating different structural treatments of the shear web in the self-supporting structural component of the longitudinal load-bearing frame of a decommissioned wind turbine blade according to the present invention. Figure 2 a and Figure 2 b represents two parallel implementation methods. Figure 2 a shows the structure of the shear web (22) with a through opening (5) while maintaining axial continuity; Figure 2 b shows the state in which the shear web (22) is partially removed or locally discontinuous in the middle section of the structural member in the axial direction, while the shear web structure is retained on both sides. Detailed Implementation

[0019] The specific embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that the following embodiments are only used to explain the technical solutions of the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0020] Reference Figure 1 , Figure 2 a and Figure 2b. This embodiment provides a self-supporting structural component based on the longitudinal load-bearing frame of a retired wind turbine blade. The structural component is obtained by cutting a retired wind turbine blade and includes a composite material shell unit and a longitudinal load-bearing frame located inside the shell unit and continuously arranged along the axial direction.

[0021] The longitudinal load-bearing frame is part of the original structure of the wind turbine blade and includes at least a spar cap and a shear web. The spar cap is arranged continuously along the axial direction, and the shear web is located in at least a portion of the axial section of the longitudinal load-bearing frame. The longitudinal load-bearing frame is integrally connected to the shell unit through the original connection part (3) of the wind turbine blade and participates in the stress of the structural components together with the shell unit, thereby forming a synergistic stress-bearing overall structural system.

[0022] During the formation of structural members, localized cutting or fiber damage to the edge areas of the longitudinal load-bearing frame is permitted, but this does not lead to the overall axial truncation of the wing cap. By maintaining the continuity of the overall force path of the longitudinal load-bearing frame, the structural member can bear its own weight without external steel trusses or independent load-bearing support frames, and is capable of withstanding external loads.

[0023] In one implementation, such as Figure 2 As shown in Figure a, the shear web (22) is provided with at least one through opening (5) while maintaining axial continuity. The through opening (5) helps to release the available space inside the structural member without disrupting the overall force path continuity of the longitudinal load-bearing skeleton, thereby improving the engineering adaptability of the structural member.

[0024] In another implementation, such as Figure 2 As shown in b, the shear web (22) is partially removed in the middle section of the structural member's axial direction, or is discontinuously arranged in a local axial section, while the shear web structure is retained on both sides of the middle section. This arrangement maintains the continuity of the overall force path of the longitudinal load-bearing skeleton, while further improving the utilization of the internal space of the structural member and its engineering adaptability.

[0025] In some embodiments, the structural member may be a linear load-bearing structure or a shell-type load-bearing structure.

[0026] Those skilled in the art can adjust the segmentation range of the shell unit, the retention range of the longitudinal load-bearing frame, and the local treatment method of the sheared web according to the blade shape, cross-sectional dimensions, and specific application scenarios of the retired wind turbine blades; any equivalent substitutions or modifications made without departing from the spirit and essence of this invention shall fall within the protection scope of this invention.

Claims

1. A self-supporting structural component based on the longitudinal load-bearing frame of a decommissioned wind turbine blade, characterized in that, The structural component is formed by cutting a retired wind turbine blade and includes: a composite material shell unit, which is a part of the wind turbine blade shell; and a longitudinal load-bearing frame, which is located inside the composite material shell unit and continuously arranged along the axial direction of the structural component, and is part of the original structure of the wind turbine blade; wherein, the longitudinal load-bearing frame includes a spar cap and has a shear web in at least a portion of the axial section; the longitudinal load-bearing frame and the composite material shell unit are connected as a whole through the original composite material structure connection interface of the wind turbine blade, and form a co-load-bearing overall structural system, and the structural component can achieve self-supporting without an external load-bearing frame.

2. The structural component according to claim 1, characterized in that: The longitudinal load-bearing frame includes a pair of wing spar caps arranged continuously along the axial direction, and at least one shear web connecting the pair of wing spar caps.

3. The structural member according to claim 1 or 2, characterized in that: The longitudinal load-bearing skeleton and the composite material shell unit jointly participate in the transmission of bending moment, shear force and / or axial force of the structural member, forming a shell-skeleton cooperative force-bearing system.

4. The structural member according to any one of claims 1 to 3, characterized in that: During the process of dividing the structural member, the edge area of ​​the longitudinal load-bearing skeleton is allowed to be partially cut or damaged, but the wing cap is not cut off along the axial direction.

5. The structural member according to any one of claims 1 to 4, characterized in that: The shear web is provided with at least one through opening while maintaining axial continuity, so as to release the usable space inside the structural member without disrupting the overall force path continuity of the longitudinal load-bearing skeleton.

6. The structural member according to any one of claims 1 to 4, characterized in that: The shear web is partially removed in the middle section of the axial direction of the structural member, or is discontinuously arranged in a local axial section, and the shear web structure is retained on both sides of the middle section to maintain the continuity of the overall force path of the longitudinal load-bearing skeleton.

7. The structural member according to any one of claims 1 to 6, characterized in that: The structural components are either linear load-bearing structures or shell-type load-bearing structures.

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