Blade self-lifting method for blade lifting

Abstract

The present invention discloses a blade self-lifting method for blade hoisting, comprising the following steps: selecting a blade lifting hole position and opening the lifting hole; reinforcing the blade lifting hole with a reinforcement plate; reinforcing the blade lifting hole area with a reinforcement cloth; passing a lifting belt around the blade lifting hole to lift and install the blade; and reinforcing the lifting hole cover plate area of ​​the installed blade. The above technical solution changes the structure of the blade itself, that is, adds a blade lifting hole design to the blade structure design link, and uses a wide lifting belt to pass around the blade lifting hole to lift the blade, eliminating the need for the design and processing of large blade lifting tooling equipment. At the same time, by using the blade lifting hole for lifting, the efficiency, reliability and safety of long blade lifting are effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of fan blade installation, and in particular to a blade self-hanging method for blade hanging. Background Art

[0002] In recent years, with the rapid development of the wind power industry, the demand for long-sized blades for wind turbines has increased, and blades have begun to develop towards larger sizes.

[0003] However, as blade length and weight continue to increase, the difficulty of blade hoisting increases dramatically, the requirements for the on-site environment become increasingly stringent, and the design and processing of hoisting tooling become increasingly difficult. Faced with the contradiction between the need for longer blades and the increasing weight and difficulty of hoisting, the wind power industry urgently needs new blade hoisting concepts.

[0004] Chinese patent document CN107381365A discloses a "wind turbine single-blade lifting device and method." Two electric hoists and two blade support brackets are installed on either side of the main frame. The two electric hoists on the same side lift the blade using a sling. One of the electric hoist hooks is equipped with an automatic release. One end of the sling is hooked to the automatic release, while the other end is looped over the blade and hooked to the other electric hoist on the same side. The sling lifts the blade until it contacts the support bracket, securely supporting the blade. First, the main hoist raises the lifting device, lowers the electric hoist, and passes the sling around the blade and connects to the automatic release. The main hoist raises the blade, removes the transport bracket, adjusts the chain length of the electric hoist, and rotates the blade to the installation position. The two electric hoists on the same side simultaneously lift the blade, clamping the blade support bracket and aligning the blade with the hub for installation. The automatic release is then released, completing the separation of the lifting device and the blade. This technical solution requires additional equipment to limit the blade lifting position, increasing the weight of the blade lifting device and making it difficult to adapt to blades of various shapes. Summary of the Invention

[0005] The present invention mainly solves the technical problems that the original technical solution requires the use of additional devices to limit the blade lifting position, there is a risk of slippage, and it is difficult to adapt to blades of various shapes. It provides a blade self-lifting method for blade lifting. By changing the structure of the blade itself, that is, adding a blade lifting hole design in the blade structure design link, the blade lifting work can be carried out by using a wide lifting belt to bypass the blade lifting hole, eliminating the design and processing of large-scale blade lifting tooling equipment. At the same time, by using the blade lifting hole for lifting, the efficiency, reliability and safety of long blade lifting are effectively guaranteed.

[0006] The above technical problems of the present invention are mainly solved by the following technical solutions: The present invention comprises the following steps:

[0007] S1 selects the position of the blade hanging hole and opens the hanging hole;

[0008] S2 reinforces the blade hanging hole with a reinforcement plate;

[0009] S3 reinforces the blade hanging hole area with reinforcement cloth;

[0010] The S4 lifting belt passes through the blade lifting hole to lift and install the blade;

[0011] S5 reinforces the lifting hole cover area of ​​the installed blades.

[0012] The blade can be lifted by using a 300mm wide lifting belt around the blade lifting holes. This eliminates the need for large blade lifting equipment and equipment design. At the same time, by lifting through the blade lifting holes, the reliability and safety of long blade lifting are effectively improved.

[0013] Preferably, step S1 defines a plurality of lifting holes on the leading and trailing edges of the main beam of the blade. The number of lifting holes on the leading and trailing edges of the main beam is equal and corresponds to each other, and the lines connecting each pair of lifting holes on the leading and trailing edges of the main beam are parallel to each other. The blade itself has four lifting holes, two of which are located 5.5 meters on either side of the center of gravity of the blade, one on the leading and one on the trailing edges of the main beam.

[0014] Preferably, step S2 of reinforcing the reinforcement plate specifically includes replacing the core material of the shell at the blade opening with a reinforcement plate, the reinforcement plate being connected to the leading edge of the beam or beam, and the reinforcement plate being provided with hanging holes. Glass fiber reinforced plastic plate reinforcement: A 20.25 mm thick (45 layers of BIAX600 biaxial fabric) glass fiber reinforced plastic plate with hanging holes is used to replace the core material of the shell and connected to the leading edge of the beam or beam. The glass fiber reinforced plastic plate has a chord length of 800 mm and a span length of 1000 mm.

[0015] Preferably, the reinforcing cloth reinforcement in step S3 includes both chord-wise and axial reinforcement of the lifting holes. Several layers of reinforcing cloth are laid both inside and outside the blade shell, covering the self-lifting holes and extending outward. The reinforcing cloth covers all adjacent self-lifting holes and extends outward, ensuring maximum safety during lifting.

[0016] Preferably, the chord-wise reinforcement for the lifting holes is applied from the leading edge of the blade to the trailing edge of the blade spar, covering all lifting holes on both the leading and trailing edges of the main beam. For chord-wise reinforcement of the lifting holes, the reinforcement fabric is BIAX600 biaxial fabric, with four layers on each side of the shell. The area extends from the leading edge of the blade to the trailing edge of the blade spar, with a span width of 2m.

[0017] Preferably, each strip of axial reinforcement fabric for the lifting holes covers both the leading and trailing lifting holes of the main beam, with the axial reinforcement fabrics parallel to each other. For axial reinforcement of the lifting holes, the reinforcement fabric is BIAX600 biaxial fabric, with five layers on each side of the hull. The axial reinforcement is 13 meters long, with both sides of the axial reinforcement covering the lifting holes and extending 1.5 meters beyond them.

[0018] Preferably, the step S5 of reinforcing the hanging hole cover plate area specifically includes placing the cover plate into the hanging hole and bonding it to the hanging hole, and then reinforcing it by hand lay-up using a reinforcement cloth. After the cover plate is bonded and fixed, the area is reinforced by hand lay-up using two layers of BIAX600 biaxial cloth.

[0019] Preferably, the lifting hole cover plate is shaped like the through hole and smaller than the hole, and is made of the same material as the reinforcement plate. The lifting hole cover plate reinforcement area is a waist-shaped cover plate measuring 196mm*344mm, slightly smaller than the hole, ensuring effective bonding between the cover plate and the hole. The material is consistent with the fiberglass plate, made of 45 layers of BIAX600 biaxial cloth.

[0020] The beneficial effects of the present invention are: by changing the structure of the blade itself, that is, adding the design of the blade lifting hole in the blade structure design link, the blade can be lifted by using a wide lifting belt to bypass the blade lifting hole, thereby eliminating the need for designing and processing large-scale blade lifting tooling equipment. At the same time, by using the blade lifting hole for lifting, the efficiency, reliability and safety of long blade lifting are effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of the present invention.

[0022] Figure 2 This is a schematic diagram of blade hoisting according to the present invention.

[0023] Figure 3 This is a schematic diagram of a blade hanging hole of the present invention

[0024] Figure 4 This is a structural diagram of a hanging hole reinforcement plate of the present invention.

[0025] Figure 5 This is a chord-wise reinforcement structure diagram of a hanging hole according to the present invention.

[0026] Figure 6 This is a structural diagram of the axial reinforcement of a hanging hole according to the present invention.

[0027] Figure 7 It is a schematic diagram of a hanging hole cover plate of the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0029] Embodiment: This embodiment is a blade self-lifting method for blade lifting, such as Figure 1 As shown, the following steps are included:

[0030] S1 Select the location of the blade hanging holes and open the hanging holes. Open several hanging holes on the leading edge and trailing edge of the main beam of the blade. The number of hanging holes on the leading edge of the main beam and the number of hanging holes on the trailing edge of the main beam are the same and correspond to each other. The lines between each pair of hanging holes on the leading edge and trailing edge of the main beam are parallel to each other. Figure 3 As shown, there are four lifting holes on the blade itself. Two lifting holes are located 5.5m on both sides of the blade's center of gravity, and are located on the leading edge and trailing edge of the main beam respectively.

[0031] S2: Reinforce the blade lifting holes with reinforcement plates, specifically including replacing the shell core material at the blade opening with reinforcement plates, connecting the reinforcement plates to the front edge of the beam or beam, and having lifting holes on the reinforcement plates. Glass fiber reinforced plastic plate reinforcement: 20.25mm thick (45 layers of BIAX600 biaxial cloth) glass fiber reinforced plastic plate with lifting holes replaces the shell core material and connects to the front edge of the beam or beam. The chord length of the glass fiber reinforced plastic plate is 800mm and the span length is 1000mm. Figure 4 .

[0032] S3 reinforces the blade hanging hole area with reinforcing cloth. The reinforcing cloth reinforcement includes chord-wise reinforcement of the hanging hole and axial reinforcement of the hanging hole. Several layers of reinforcing cloth are laid inside and outside the blade shell. The reinforcing cloth covers the hanging hole and extends outward. The reinforcement area of ​​the chord-wise reinforcement of the hanging hole is laid from the mold seam of the leading edge of the blade to the trailing edge of the blade beam, covering all the hanging holes on the leading and trailing edge sides of the main beam respectively. Chord-wise reinforcement of the hanging hole area: The reinforcing cloth is BIAX600 biaxial cloth, 4 layers each inside and outside the shell. The area is laid from the mold seam of the leading edge of the blade to the trailing edge of the blade beam, with a span width of 2m. For details, see Figure 5 Each axial reinforcement cloth of the lifting hole axial reinforcement covers a pair of main beam front edge side lifting holes and rear edge side lifting holes at the same time, and the axial reinforcement cloths are parallel to each other. Axial reinforcement of the lifting hole area: The reinforcement cloth is BIAX600 biaxial cloth, 5 layers inside and outside the shell. The axial reinforcement length is 13m, and the axial reinforcement on both sides covers the self-lifting hole and exceeds 1.5m, see Figure 6 .

[0033] S4 lifting belt passes through the blade lifting hole to lift and install the blade; Figure 2 As shown in the figure, the blade can be lifted by using a 300mm wide lifting belt to pass through the blade lifting hole, eliminating the need for designing and processing large blade lifting equipment.

[0034] S5 reinforces the area of ​​the lifting hole cover plate of the installed blade. The specific reinforcement of the lifting hole cover plate area includes placing the cover plate into the lifting hole and gluing it to the lifting hole, and then reinforcing it with reinforcing cloth by hand lay-up. The lifting hole cover plate is the same shape as the through hole and smaller than the lifting hole, and the material of the lifting hole cover plate and the reinforcement plate is the same. Figure 7 As shown, the lifting hole cover plate area is reinforced: the cover plate is a waist-shaped plate measuring 196mm x 344mm, slightly smaller than the lifting hole to ensure effective bonding between the cover plate and the lifting hole. The material is the same as the fiberglass reinforced plastic plate, and it is laid with 45 layers of BIAX600 biaxial cloth. After the cover plate is bonded and fixed, the area is hand-laid with 2 layers of BIAX600 biaxial cloth.

[0035] The sling can directly fix the blade through the blade's self-lifting hole, greatly reducing the risk of blade slippage; the contact points between the sling and the blade are reasonably strengthened to reduce the risk of damage to the blade caused by lifting, especially avoiding damage to the trailing edge by the sling; saving the cost of making large blade lifting tooling; improving lifting efficiency, reducing the risk of blade lifting, and having a wide range of applicability.

Claims

1. A blade self-hanging method for blade hoisting, characterized in that: The following steps are involved: S1 selects the position of the blade hanging hole and opens the hanging hole; S2 reinforces the blade hanging hole with a reinforcement plate; S3 reinforces the blade hanging hole area with reinforcement cloth; The S4 lifting belt passes through the blade lifting hole to lift and install the blade; S5 reinforces the lifting hole cover area of ​​the installed blades.

2. A blade self-hanging method for blade hoisting according to claim 1, characterized in that: In step S1, a plurality of lifting holes are respectively opened on the leading edge side and the trailing edge side of the main beam of the blade. The number of the lifting holes on the leading edge side of the main beam and the lifting holes on the trailing edge side are the same and correspond one to one. The connecting lines between each pair of the lifting holes on the leading edge side and the lifting holes on the trailing edge side of the main beam are parallel to each other.

3. The blade self-hanging method for blade hoisting according to claim 1, characterized in that: The reinforcing plate reinforcement in step S2 specifically includes replacing the shell core material at the blade opening with the reinforcing plate, the reinforcing plate is connected to the front edge of the beam or the small beam, and the reinforcing plate is provided with a hanging hole.

4. The blade self-hanging method for blade hoisting according to claim 2, characterized in that: The reinforcing cloth reinforcement in step S3 includes chord-wise reinforcement of the lifting holes and axial reinforcement of the lifting holes. Several layers of reinforcing cloth are laid inside and outside the blade shell, and the reinforcing cloth covers the lifting holes and extends outward.

5. The blade self-hanging method for blade hoisting according to claim 4, characterized in that: The reinforcement area of ​​the chord-wise reinforcement of the hanging holes is spread from the mold seam at the leading edge of the blade to the trailing edge of the blade beam, covering all the hanging holes on the leading edge side and the trailing edge side of the main beam respectively.

6. A blade self-hanging method for blade hoisting according to claim 4, characterized in that: Each axial reinforcement cloth for axially reinforcing the hanging holes covers a pair of hanging holes on the leading edge side and the hanging holes on the trailing edge side of the main beam at the same time, and the axial reinforcement cloths are parallel to each other.

7. The blade self-hanging method for blade hoisting according to claim 1, characterized in that: The step S5 of reinforcing the hanging hole cover plate area specifically includes placing the cover plate into the hanging hole and bonding it to the hanging hole, and then reinforcing it by hand lay-up using a reinforcing cloth.

8. The blade self-hanging method for blade hoisting according to claim 1, characterized in that: The hanging hole cover plate is consistent with the shape of the through hole and is smaller than the hanging hole, and the hanging hole cover plate is made of the same material as the reinforcement plate.

Images