Method for repairing damaged lightning receiving base of wind power blade

Abstract

The invention discloses a method for repairing damage to a lightning receiving base of a wind power blade. The method comprises the steps that the SS face and the PS face of the wind power blade are subjected to paint polishing; finding out a sensor base by using a strong light flashlight, scribing and marking, and drawing the size of a window to be opened by taking the position of the base as a center; removing the lightning protection sensor on the SS surface; drilling holes at the lineation marks, and then cutting out a glass fiber reinforced plastic plate for later use; removing the abnormal lightning receiving base; a new lightning receiving base is installed and is bonded and restored through structural adhesive; the cut glass fiber reinforced plastic plate is restored through glue joint, and the prototype surface supporting effect is achieved; heating and curing; staggered-layer grinding is conducted on the cutting recovery position; cleaning and cleaning; manually pasting and laying the same kind of glass fiber cloth: recovering according to the fiber direction of the original laying layer; after heating and curing, polishing the surface and cleaning; and surface paint treatment. The method for repairing the lightning receiving base of the wind power blade is easy to operate, low in common equipment and environment requirements, rapid and easy to use.

Description

Technical Field

[0001] The invention relates to a method for repairing a damaged lightning termination base of a wind turbine blade, and belongs to the technical field of wind power engines. Background Art

[0002] At present, the lightning receptor base of wind turbine blades is fixed inside the blades by vacuum infusion and adhesive bonding. Some lightning receptors are close to the blade tip, and the internal space is small, making replacement difficult. The mainstream wind turbine blades have a lightning receptor base at the blade tip, and there is another lightning receptor base a few meters away from the blade tip. In addition, the on-site maintenance environment of wind turbine blades is relatively harsh, and sometimes they are repaired at high altitudes, so the maintenance method needs to be simple, fast, and require less equipment.

[0003] CN213472270U discloses a shell preforming mold suitable for the comminuted damage of the tip of a wind turbine blade. The external repair requires the pre-design and production of the mold, which takes a long time and is costly, and is not conducive to rapid on-site repair.

[0004] CN116950858A discloses a method for repairing blades of a wind turbine generator set, which mainly relies on visual judgment of blade damage, has high requirements on environmental conditions and equipment, and has no specific repair method.

[0005] CNCN115013264A discloses a method for predicting the glue filling volume for repairing damage to in-service high-altitude wind turbine blades. The method mainly determines the amount of resin required based on the damage, and also requires laboratory testing. The on-site operation is difficult and requires high-precision equipment. Summary of the invention

[0006] The problem to be solved by the present invention is to provide a repair method for replacing a lightning arrester base of a wind turbine blade from the outside.

[0007] In order to solve the above problems, the present invention provides a method for repairing a damaged lightning termination base of a wind turbine blade, comprising the following steps:

[0008] Step 1): Paint and polish the area between the SS surface of the wind turbine blade and the blade tip, and paint and polish the PS surface after folding it;

[0009] Step 2): Use a strong flashlight to find the sensor base and mark it. Centered on the base, draw the size of the window you want to open.

[0010] Step 3): Use circlip pliers to remove the lightning arrester on the SS surface;

[0011] Step 4): Drill holes at the scribe marks, and then cut out the fiberglass sheet and place it aside for later use;

[0012] Step 5): Remove the abnormal lightning termination base;

[0013] Step 6): Install a new lightning termination base and restore it with structural adhesive;

[0014] Step 7): The cut fiberglass plate is restored by gluing to support the prototype surface;

[0015] Step 8): heating and curing;

[0016] Step 9): Perform staggered grinding at the cut restoration site;

[0017] Step 10): Clean up;

[0018] Step 11): Hand lay up the same kind of glass fiber cloth: restore the fiber direction according to the original lay-up;

[0019] Step 12): After heating and curing, polish the surface and clean it;

[0020] Step 13): Surface paint treatment.

[0021] Preferably, in step 1), the PS surface is folded 100 mm and painted and polished in the same manner.

[0022] Preferably, in step 4), 4 mm holes are drilled at the four corners of the scribe marks.

[0023] Preferably, in step 8), after heating and curing, the structural adhesive reaches a Barcol hardness of 33 HBa or above.

[0024] Preferably, in the step 12), after heating and curing, the Barcol hardness is detected to be above 65 Hba.

[0025] Compared with the prior art, the present invention is characterized in that:

[0026] 1. Open skylight on the surface;

[0027] 2. The glass steel plate of the skylight is glued and restored as the inner lining to maintain the surface;

[0028] 3. The skylight can be polished as long as the restoration hardness reaches about half of the final required Bacolod hardness;

[0029] 4. Staggered grinding;

[0030] 5. Use the same type of glass fiber cloth;

[0031] 6. The original ply fiber direction is restored.

[0032] The wind turbine blade lightning arrester base repair method provided by the present invention is simple to operate, uses common equipment, has low environmental requirements, and is quick and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1-6A schematic diagram of different steps in the method for repairing damage to a wind turbine blade lightning termination base provided by the present invention. DETAILED DESCRIPTION

[0034] In order to make the present invention more clearly understood, preferred embodiments are described in detail as follows.

[0035] Example

[0036] A method for repairing a damaged lightning termination base of a wind turbine blade comprises the following steps:

[0037] Step 1): Paint and polish the area between the SS surface of the wind turbine blade and the blade tip, and paint and polish the PS surface 100mm later;

[0038] Step 2): Use a strong flashlight to find the sensor base and mark it. Center the base and draw the size of the window you want to open (e.g. Figure 1 shown);

[0039] Step 3): Use circlip pliers to remove the lightning arrester on the SS surface;

[0040] Step 4): Drill 4mm holes at the four corners of the scribe mark, then cut out the fiberglass plate and place it for later use (such as Figure 2 shown);

[0041] Step 5): Remove the abnormal lightning termination base (such as Figure 3 shown);

[0042] Step 6): Install a new lightning termination base and restore it with structural adhesive;

[0043] Step 7): The cut fiberglass plate is restored by gluing to support the prototype surface (such as Figure 4 shown);

[0044] Step 8): heat and cure, and the structural adhesive reaches a Barcol hardness of 33HBa or above;

[0045] Step 9): Perform staggered grinding at the cut restoration site (such as Figure 5 shown);

[0046] Step 10): Clean up;

[0047] Step 11): Hand lay the same kind of glass fiber cloth: restore the fiber direction of the original layer (such as Figure 6 shown);

[0048] Step 12): After heating and curing, the Barcol hardness is tested to be above 65Hba, and the surface is polished and cleaned;

[0049] Step 13): Surface paint treatment.

Claims

1. A method for repairing a damaged lightning termination base of a wind turbine blade, characterized in that: The following steps are involved: Step 1): Paint and polish the area between the SS surface of the wind turbine blade and the blade tip, and paint and polish the PS surface after folding it; Step 2): Use a strong flashlight to find the sensor base and mark it. Centered on the base, draw the size of the window you want to open. Step 3): Use circlip pliers to remove the lightning arrester on the SS surface; Step 4): Drill holes at the scribe marks, and then cut out the fiberglass sheet and place it aside for later use; Step 5): Remove the abnormal lightning termination base; Step 6): Install a new lightning termination base and restore it with structural adhesive; Step 7): The cut fiberglass plate is restored by gluing to support the prototype surface; Step 8): heating and curing; Step 9): Perform staggered grinding at the cut restoration site; Step 10): Clean up; Step 11): Hand lay up the same kind of glass fiber cloth: restore the fiber direction according to the original lay-up; Step 12): After heating and curing, polish the surface and clean it; Step 13): Surface paint treatment.

2. The method for repairing the damaged lightning termination base of a wind turbine blade according to claim 1, characterized in that: In the step 1), the PS surface is folded 100 mm and painted and polished in the same manner.

3. The method for repairing the damaged lightning termination base of a wind turbine blade according to claim 1, characterized in that: In step 4), 4 mm holes are drilled at the four corners of the scribe marks.

4. The method for repairing the damaged lightning termination base of a wind turbine blade according to claim 1, characterized in that: In the step 8), after heating and curing, the structural adhesive reaches a Barcol hardness of 33 HBa or more.

5. The method for repairing the damaged lightning termination base of a wind turbine blade according to claim 1, characterized in that: In the step 12), after heating and curing, the Barcol hardness is detected to be above 65 Hba.

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