Lifting and demolding method for prefabricated blade root corresponding to wind power blade drill hole

Abstract

The invention discloses a hoisting and demolding method for a prefabricated blade root corresponding to drilling of a wind power blade. The hoisting and demolding method comprises the steps that S1, an embedded nest is manufactured; s2, an embedded nest is installed; s3, designing a hoisting tool; s4, the tool is combined, and demolding is conducted; and S5, post-processing the product. Wherein the embedded nest is embedded into the blade root module integrating the prefabricated blade root body and the remaining section. According to the method, in the forming stage of the prefabricated blade root of the drilling model, the embedding sleeve is embedded in the end face of the blade root, after curing forming, the hoisting tool is connected with the embedding sleeve in a matched mode, and the purpose of hoisting the blade root is achieved; a pouring lifting lug in the prior art is replaced with embedded nesting, the operation safety risk is reduced, the hidden danger that the lifting lug is broken and falls off is effectively avoided, and the lifting safety problem and the lifting convenience defect of an existing prismatic table glass fiber reinforced plastic lifting lug are solved; and the pre-embedded nesting is connected to the remaining section, overall cutting can be conducted after demolding operation, the integration degree of the prefabricated blade root is high, and the overall strength is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine blade manufacturing technology, specifically relating to a method for lifting and demolding prefabricated blade roots corresponding to drilling holes in wind turbine blades. Background Technology

[0002] Pre-embedded bolt sleeves are a commonly used technology in the wind turbine blade industry. However, this technology suffers from problems such as wrinkles at the ends of the embedded parts. Furthermore, with the development of blade technology, improving blade forming efficiency has become a crucial issue. The pre-embedded bolt sleeve technology involves the installation of numerous small components, including pre-embedded bolt sleeves, wedge blocks, and filler blocks, which is time-consuming. Therefore, blade root prefabrication technology was developed. Blade root prefabrication technology refers to the separate molding and curing of the wind turbine blade root before installation into a blade mold to complete the overall blade forming. By prefabricating the critical root area of ​​the blade, the prefabricated blade root becomes a key structural component connecting the wind turbine blade to the hub, primarily responsible for load transmission.

[0003] After the precast blade root is integrally formed, it needs to be demolded. The current main procedure is as follows: After the precast blade root fiberglass cloth (fiberglass cloth woven from fiberglass yarn) is laid, perforated lifting lugs are made using fiberglass cloth at the blade root truncated pyramid (the area where the precast blade root is joined to the mold). Resin is poured in and cured. After curing, the lifting lugs are shaped to ensure that the holes in the lifting lugs can be passed through the lifting hooks. The lifting hooks are then inserted into the lifting lugs, and the blade is lifted using an overhead crane.

[0004] The problems with the above solution are as follows: 1) To ensure the quality of the lifting lugs, the area around the lifting lugs has a large number of fiberglass cloth layers, making grouting difficult and prone to incomplete grouting; 2) Because the precast blades weigh several tons, there is a risk of delamination and breakage of the fiberglass after the lifting lugs have been cured; 3) When the precast leaf roots are hoisted into the main mold, the lifting lugs need to be cut off, which contaminates the working surface and affects the quality of the fabric laying.

[0005] Therefore, it is necessary to research and develop a method for lifting and demolding precast blade roots for drilling holes in wind turbine blades to solve the above problems. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a method for lifting and demolding precast blade roots corresponding to drilling holes in wind turbine blades. This method involves pre-embedding nests on the end face of the blade root during the precast blade root forming stage of the drilling model. After curing, the pre-embedded nests are matched and connected to the lifting fixtures to achieve the purpose of lifting the blade root. By using pre-embedded nests instead of the existing method of pouring lifting lugs for demolding, the entire blade root can be cut off afterward. This results in a high degree of integration of the precast blade root and a significant improvement in overall strength, thus solving the safety issues and ease-of-use deficiencies of existing truncated fiberglass lifting lugs.

[0007] The embodiments of the present invention provide the following technical solutions: A method for lifting and demolding precast blade roots corresponding to drilling holes in wind turbine blades includes the following steps: S1. Construct a pre-embedded nest, which is made of rigid material; S2. Install pre-embedded nesting: Make a prefabricated leaf root module that integrates the prefabricated leaf root body and the reserved section, and embed the pre-embedded nesting in the reserved section; S3. Design lifting fixtures: Based on the number and distribution of the pre-embedded nesting parts, and in combination with the weight of the leaf root module to be lifted, design matching lifting fixtures. S4. Assemble the tooling and demold: Use a lifting tool or overhead crane hook to lift the tooling, align the tooling holes with the pre-embedded nesting, and use connectors to firmly fix the lifting tooling to the blade root module. Adjust the connection position between the lifting tool or overhead crane and the lifting tooling to match the center of gravity so that the blade root module does not tilt significantly after being lifted. Then, carry out the demolding and lifting work of the blade root module. S5. Post-processing of the product: The leaf root module is skinned and formed. The remaining section of the leaf root module is cut off by cutting equipment. The pre-embedded nest falls off with the cut material and is then applied to the pre-made leaf root body.

[0008] Preferably, in S1, the pre-embedded nest is configured as a blind hole nut post, the end of which has an inner hole with an inner size between M30 and M44, the inner hole depth is set to 50-100mm, the outer diameter of the pre-embedded nest is 1 / 3-1 / 2 of the thickness of the end face of the remaining section, and the wall thickness of the pre-embedded nest is set to 10-15mm. The outer surface of the blind hole nut post is provided with coarse or fine threads, and the inner surface of the pre-embedded nest is provided with fine threads.

[0009] Preferably, the pre-embedded nest is made of metal or fiberglass.

[0010] Preferably, the outer contour of the pre-embedded nested section is set as cylindrical, square or regular polygonal.

[0011] Preferably, in S2, the combination process of the pre-embedded nest and the leaf root module is as follows: S2.1. Fiberglass cloth is laid in the mold of the blade root preform. The length of the fiberglass cloth is not less than the sum of the length of the preformed blade root body and the remaining section. S2.2 During or after the fiberglass cloth is laid, a pre-embedded nest is placed in the middle of the multi-layer fiberglass cloth in the remaining section, with the opening facing outwards and the end of the pre-embedded nest with the inner hole exposed in the leaf root preform mold. S2.3 Clean the inner and outer surfaces of the pre-embedded nest, then temporarily seal the end of the inner hole of the pre-embedded nest, vacuum the leaf root preform mold, and use resin injection. S2.4 After the grouting and curing, remove the sealing material from the pre-embedded nested inner hole and clean the pre-embedded nest.

[0012] Preferably, in S2.1, the outer side of the reserved section is taken as the starting point for laying the fiberglass cloth, the boundary line between the reserved section and the precast blade body is taken as the design starting point of the precast blade body, and the distance between the outer side of the reserved section and the design starting point of the precast blade body is not less than 50mm.

[0013] Preferably, the pre-embedded nested end face is flush with or exceeds the starting point of the fiberglass cloth by 0-2mm, and the distance between the pre-embedded nested end and the design starting point of the precast leaf body is not less than 5mm.

[0014] Preferably, the number of pre-embedded nests is at least three, wherein two pre-embedded nests are axially symmetrically distributed below the two truncated pyramids of the precast blade body, and the distance between the pre-embedded nests at the end and the truncated pyramid end face of the precast blade body is not less than 50mm, and the remaining pre-embedded nests are evenly distributed between the pre-embedded nests at both ends and arranged circumferentially along the outer arc trajectory of the remaining section.

[0015] Preferably, the lifting fixture includes a crossbeam and a lifting beam. The lifting beam is welded to the top of the crossbeam, and a vertical beam is provided at the bottom of the crossbeam. The top of the vertical beam is detachably installed from the crossbeam. A triangular plate support frame is connected to the lifting beam, the crossbeam, and the vertical beam. The horizontal beam has combination holes at both ends and the vertical beam has combination holes at the bottom. Multiple combination holes are distributed one-to-one with multiple pre-embedded nests. The spacing between the combination holes at both ends of the horizontal beam is equal to the spacing between the two outermost pre-embedded nests. Several pre-embedded nests are arranged in a linear array on the suspension beam.

[0016] Preferably, the connector is a straight bolt, which passes through the combined hole and engages with the pre-embedded nested inner hole thread.

[0017] Compared with the prior art, the present invention has the following advantages: By pre-embedding nests on the end face of the blade root during the pre-formation stage of the drilled model, and then connecting them with the pre-embedded nests after curing, the blade root can be lifted. The pre-embedded nests replace the existing injection-filled lifting lugs, reducing operational safety risks, effectively avoiding the hidden danger of lug breakage and detachment, and solving the existing lifting safety problems and ease of lifting of the truncated fiberglass lifting lugs. Moreover, the pre-embedded nests are connected to the remaining section, and can be completely removed after demolding, resulting in a high degree of integration of the pre-formed blade root and a significant improvement in overall strength.

[0018] The precast blade root lifting and demolding method provided by this invention simplifies the operation and features pre-embedded nesting and corresponding lifting fixtures. The fixtures are simple to design, meet the requirements of high-efficiency processing, reduce production costs, and have a reasonable overall process design. The demolding and lifting process is relatively stable, with operational safety and reliability, making it easy to promote and apply. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the process of lifting and demolding the precast blade root of a wind turbine blade, which is provided by the present invention.

[0020] Figure 2 This is a schematic diagram of one embodiment of the lifting fixture used for lifting and demolding precast leaf roots in this invention.

[0021] Figure 3 This is a schematic diagram of the connection structure between the lifting fixture and the pre-embedded nested structure on the remaining section in this invention.

[0022] Figure 4 This is a schematic diagram of the leaf root module in this invention.

[0023] Figure 5 For the present invention Figure 4 A partial top-section diagram of the structure shown.

[0024] Figure 6 This is a three-dimensional structural view of one embodiment of the pre-embedded nesting in the present invention.

[0025] Figure 7 This is a pre-embedded nested main view provided in Embodiment 1 of the present invention.

[0026] Figure 8 For the present invention Figure 7 A half-section view of the structure shown.

[0027] Figure 9 This is a pre-embedded nested main view provided in Embodiment 2 of the present invention.

[0028] Figure 10 For the present invention Figure 9 A half-section view of the structure shown.

[0029] Marked in the image: Embedded nesting -1; Precast blade body -2; Reservation section -3; Lifting fixture -4; Connector -5; Design starting point -C; Horizontal beam-41; Suspension beam-42; Vertical beam-43; Triangular plate support frame-44; Combined hole-45; Pre-embedded nesting-46. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., 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 for simplifying the description, and do not 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can refer to a detachable connection: it can be a mechanical connection; it can also be an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] like Figures 1-5 The method shown is for lifting and demolding precast blade roots corresponding to drilling holes in wind turbine blades, including the following steps: S1. The pre-embedded nest 1 is made of rigid material, such as the metal material or fiberglass material provided in this embodiment.

[0034] For the processing configuration of the pre-embedded nested type 1, this application provides the following: Figure 6In one embodiment, the pre-embedded nest 1 is configured as a blind hole nut post. The end of the blind hole nut post has an inner hole with an inner dimension between M30 and M44, and the inner hole depth is set to 50-100mm. The outer diameter of the pre-embedded nest 1 is 1 / 3 to 1 / 2 of the thickness of the end face of the remaining section 3, and the wall thickness of the pre-embedded nest 1 is set to 10-15mm. Specifically, the diameter of the pre-embedded nest 1 is adjusted according to the thickness of the end face of the leaf root module. Of course, the pre-embedded nest 1 can also be designed as a through hole with a plug.

[0035] In addition to the cylindrical structure provided in this embodiment, the outer contour of the pre-embedded nested section 1 can also be set as a square or regular polygon.

[0036] The outer surface of the blind hole nut column is provided with coarse or fine threads, and the inner surface of the pre-embedded nest 1 is provided with fine threads.

[0037] Example 1: The outer surface of the blind hole nut post is set as follows Figures 7-8 The coarse thread condition shown.

[0038] Example 2: The outer surface of the blind hole nut post is set as follows Figures 9-10 The fine thread condition shown.

[0039] The purpose of the external thread is to increase the contact area with the blade root module, increase the connection strength, and prevent it from being pulled out or falling off during the hoisting process; the internal thread is used for combination with connector 5. This design can meet the requirements for lifting a product weighing 5T.

[0040] S2. Install the pre-embedded nest 1: Fabricate a blade root module that integrates the prefabricated blade root body 2 and the remaining section 3, and embed the pre-embedded nest 1 into the remaining section 3. Specifically, the combination process of the pre-embedded nest 1 and the blade root module is as follows: S2.1. Fiberglass cloth is laid in the blade root preform mold, and the length of the fiberglass cloth is not less than the sum of the lengths of the preformed blade root body 2 and the remaining section 3.

[0041] When laying the fiberglass cloth, the following dimensions should be set: the outer side of the reserved section 3 is the starting point for laying the fiberglass cloth, the boundary line between the reserved section 3 and the precast blade body 2 is the design starting point C of the precast blade body 2, and the distance between the outer side of the reserved section 3 and the design starting point C of the precast blade body 2 is not less than 50mm.

[0042] S2.2 During or after the fiberglass cloth is laid, place a pre-embedded nest 1 in the middle of the multi-layer fiberglass cloth at the remaining section 3, with the opening facing outwards and the end of the pre-embedded nest 1 with an inner hole protruding from the leaf root preform mold.

[0043] When laying out the pre-embedded nest 1, pay attention to the following dimensions: the end face of the pre-embedded nest 1 should be flush with or exceed the starting point of the fiberglass cloth by 0-2mm, and the distance between the end of the pre-embedded nest 1 and the design starting point C of the precast blade body 2 should not be less than 5mm.

[0044] Furthermore, in the above scheme, the number of pre-embedded nests 1 is set to at least three, of which two pre-embedded nests 1 are axially symmetrically distributed below the two truncated pyramids of the precast blade body 2, and the distance between the pre-embedded nests 1 at the end and the end face of the truncated pyramid of the precast blade body 2 is not less than 50mm. The remaining pre-embedded nests 1 are evenly distributed between the pre-embedded nests 1 at both ends and are arranged circumferentially along the outer arc trajectory of the remaining section 3.

[0045] S2.3 Clean the inner and outer surfaces of the pre-embedded nest 1, and then temporarily seal the end of the inner hole of the pre-embedded nest 1 to prevent resin from being injected into the inner hole and improve the protective effect. Vacuum the leaf root preform mold and inject resin. S2.4 After the grouting and curing, remove the sealing material from the inner hole of the pre-embedded nest 1 and clean the pre-embedded nest 1.

[0046] S3. Design lifting fixture 4: Based on the number and distribution of the pre-embedded nesting 1, and in combination with the weight of the leaf root module to be lifted, design the matching lifting fixture 4.

[0047] In the embodiments provided in this application, as a feasible implementation of the lifting fixture 4, it includes a horizontal beam 41 and a lifting beam 42. The lifting beam 42 is welded to the top of the horizontal beam 41, and a vertical beam 43 is provided at the bottom of the horizontal beam 41. The top of the vertical beam 43 is detachably installed from the horizontal beam 41. A triangular plate support frame 44 is connected between the lifting beam 42, the horizontal beam 41 and the vertical beam 43. Combination holes 45 are provided at both ends of the horizontal beam 41 and at the bottom of the vertical beam 43. Multiple combination holes 45 correspond one-to-one with multiple pre-embedded nests 1, and the spacing between the combination holes 45 at both ends of the horizontal beam 41 is equal to the spacing between the two outermost pre-embedded nests 1. Several pre-embedded nests 46 are arranged in a linear array on the lifting beam 42. The pre-embedded nests 46 are matched with the hooks of the lifting equipment or overhead crane. Different hole positions on the lifting beam 42 can accommodate the lifting of blade root modules of different weights, ensuring a stable center of gravity. This fixture design adopts a steel frame structure, and the vertical beams 43 can be added as needed to meet the lifting requirements of products up to 5T.

[0048] S4. Assemble the tooling and demold: Use a lifting device or overhead crane hook to lift tooling 4, align the tooling holes with the pre-embedded nest 1, and use connector 5 to firmly fix the lifting tooling 4 to the leaf root mold. Connector 5 is a straight bolt, which passes through the assembly hole 45 and is threaded into the inner hole of the pre-embedded nest 1. Adjust the connection position between the lifting device or overhead crane and the lifting tooling 4 to match the center of gravity, so that the leaf root mold does not tilt significantly after being lifted. Then, perform the demolding and lifting of the leaf root mold.

[0049] S5. Post-processing of the product: The blade root module is skinned and formed. The remaining section 3 of the blade root module is cut off using a cutting device. The pre-embedded nest 1 falls off with the cut material, so that the pre-embedded nest 1 will not remain in the prefabricated blade root body 2. Finally, the prefabricated blade root body 2 can be applied.

[0050] The above are merely specific embodiments of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A method for hoisting and demolding a pre-manufactured root of a wind turbine blade drilled corresponding to a hole of the blade, characterized in that: It comprises the following steps: S1, making a pre-embedded nest (1), the pre-embedded nest (1) is made of rigid material; S2, installing the pre-embedded nest (1): making a blade root module of the precast blade root body (2) and the remaining section (3) in one, embedding the pre-embedded nest (1) on the remaining section (3); S3, design lifting tool (4): according to the number of pre-embedded nest (1) and its distribution, and combined with the weight of the blade root module to be lifted, design the matching lifting tool (4); S4, combined tool and demolding: using lifting appliance or crane hook lifting tool (4), the tool hole position is connected with the pre-embedded nest (1), and the lifting tool (4) is fixed firmly with the blade root module using connecting piece (5), adjusting the connection position of lifting appliance or crane hook and lifting tool (4), matching the center of gravity, so that the blade root module does not tilt after lifting, then demolding and lifting the blade root module; S5, product post-processing: the blade root module skin is formed, the remaining section (3) of the blade root module is cut off through cutting equipment, the pre-embedded nest (1) falls off with the cutting material, and the precast blade root body (2) is applied.

2. A method for lifting and demolding a pre-manufactured root of a wind turbine blade drilled corresponding to its bore, according to claim 1, characterized in that: In S1, the pre-embedded nest (1) is provided as a blind hole nut column, the end of the blind hole nut column is provided with an inner hole with an inner size of M30-M44, the inner hole depth is set to 50-100mm, the outer diameter of the pre-embedded nest (1) is 1 / 3-1 / 2 of the thickness of the end face of the remaining section (3), and the wall thickness of the pre-embedded nest (1) is set to 10-15mm; The outer surface of the blind hole nut column is provided with coarse or fine threads, and the inner surface of the pre-embedded nest (1) is provided with fine threads.

3. A method for lifting and demolding a pre-manufactured root of a wind turbine blade drilled corresponding to its bore, according to claim 2, characterized in that: The pre-embedded nest (1) is made of metal material or glass steel material.

4. A method for lifting and demolding a pre-manufactured root of a wind turbine blade drilled corresponding to its bore, according to claim 2, characterized in that: The cross section of the pre-embedded nest (1) is provided as a cylindrical, square or regular polygon.

5. A method for lifting and demolding a pre-manufactured root of a wind turbine blade drilled corresponding to its boreholes, according to claim 1, characterized in that: In S2, the combination process of the pre-embedded nest (1) and the blade root module is as follows: S2.1, lay glass fiber cloth in the blade root preform mold, the laying length of the glass fiber cloth is not less than the sum of the lengths of the precast blade root body (2) and the remaining section (3); S2.2, during or after the laying of the glass fiber cloth, place the pre-embedded nest (1) in the middle of the multiple layers of glass fiber cloth at the position of the remaining section (3), so that the hole position faces outward, and the end of the pre-embedded nest (1) with the inner hole is exposed from the blade root preform mold; S2.3, clean the inner and outer surfaces of the pre-embedded nest (1), then temporarily seal the end of the inner hole of the pre-embedded nest (1), vacuumize the blade root preform mold, and use resin to fill; S2.4, after filling and curing, remove the sealing material in the inner hole of the pre-embedded nest (1), and clean the pre-embedded nest (1).

6. A method for lifting and demolding a pre-manufactured root of a wind turbine blade drilled corresponding to its bore, according to claim 5, characterized in that: In S2.1, the outer side of the remaining section (3) is the starting point of the glass fiber cloth laying, the junction line between the remaining section (3) and the precast blade root body (2) is the design starting point of the precast blade root body (2), and the distance between the outer side of the remaining section (3) and the design starting point of the precast blade root body (2) is not less than 50mm.

7. A method for lifting and demolding a pre-manufactured root of a wind turbine blade drilled corresponding to its bore, according to claim 6, characterized in that: The end face of the pre-embedded nest (1) is flush with or exceeds the starting point of the glass fiber cloth by 0-2mm, and the end of the pre-embedded nest (1) is not less than 5mm away from the design starting point of the precast blade root body (2).

8. A method for lifting and demolding a pre-manufactured root of a wind turbine blade drilled corresponding to its bore, according to claim 5, characterized in that: The number of the pre-embedded nests (1) is at least three, two of which are symmetrically distributed below the two prismatic platforms of the prefabricated blade root body (2), and the pre-embedded nest (1) at the end is spaced apart from the end face of the prismatic platform of the prefabricated blade root body (2) by not less than 50 mm, and the remaining pre-embedded nests (1) are evenly distributed between the pre-embedded nests (1) at the two ends and are arranged along the outer arc track of the remaining section (3).

9. A method for lifting and demolding a pre-manufactured root of a wind turbine blade drilled corresponding to its bore, according to claim 8, characterized in that: The lifting tool (4) comprises a cross beam (41) and a lifting beam (42), the lifting beam (42) is welded at the top end of the cross beam (41), the bottom of the cross beam (41) is provided with a vertical beam (43), and the top end of the vertical beam (43) is detachably installed with the cross beam (41), and the lifting beam (42), the cross beam (41) and the vertical beam (43) are jointly connected with a triangular plate support frame (44); The bottom end of the vertical beam (43) and the two ends of the cross beam (41) are provided with a combination hole (45), a plurality of combination holes (45) are one-to-one corresponding distributed with a plurality of pre-embedded nests (1), and the distance between the combination holes (45) at the two ends of the cross beam (41) is equal to the distance between the two outermost pre-embedded nests (1), and a plurality of linearly arrayed pre-embedded nests (46) are arranged on the lifting beam (42).

10. A method for lifting and demolding a pre-manufactured root of a wind turbine blade drilled corresponding to its bore according to claim 1, characterized in that: The connecting piece (5) is provided as a straight rod bolt, which penetrates through the combination hole (45) and is threadedly matched with the inner hole of the pre-embedded nest (1).

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