Method for repairing wind turbine blade lightning protection copper mesh offset

Abstract

The application discloses a repairing method for wind power blade lightning protection copper mesh offset, which realizes lightning protection and conduction of the area by adding a correcting copper mesh at the position of the structural design copper mesh offset under the premise of not damaging the structural design copper mesh; the repairing method for the wind power blade lightning protection copper mesh offset specifically comprises the following eight steps: positioning of the copper mesh offset area and treatment of the outer surface; prefabrication and laying of a copper mesh connecting assembly and a reinforcing copper mesh; laying of the correcting copper mesh; laying of surface felt or other glass fiber fabric on the outer surface of the copper mesh; arrangement of surface auxiliary materials, a pouring system and an air extraction system; vacuum conduction; surface treatment of the repaired area; and connection of the copper mesh connecting assembly with a main lightning protection line of the blade. The application can ensure that the wind power blade lightning protection copper mesh has good conduction effect and lightning protection effect after repair, and the repairing method has the advantages of simple operation, low maintenance cost, high repairing quality and the like, and effectively reduces the cost of the wind power blade.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wind power blades, in particular to a wind power blade lightning protection copper mesh offset repair method. BACKGROUND

[0002] At present, wind power blades are developing towards large blade types, and with the continuous increase in blade length, the weight of the blades is also increasing. Many new materials and technologies are also applied in the field of blade manufacturing. For example, a carbon beam of a blade is currently made of carbon fiber material, which reduces the mass of the blade while also increasing the strength of the blade. Carbon fiber has conductive properties, and the carbon fiber carbon beam needs to be protected to prevent lightning damage to the blade. A copper mesh is laid on the outer surface of the carbon fiber carbon beam, and the copper mesh is connected with the main lightning protection line of the blade, which can effectively introduce the lightning current on the outer surface of the blade into the ground through the fan lightning protection system, avoiding damage to the blade due to lightning. During the manufacturing process of the blade, the position of the copper mesh will inevitably be offset due to human factors. If the copper mesh does not completely cover the carbon fiber carbon beam, the fan blade is prone to lightning damage in rainy weather, and the lightning current directly hits the carbon fiber carbon beam. Slight lightning causes damage to the blade, and the fan cannot operate normally. Severe lightning can cause the entire blade to be scrapped, and the safety hazards and economic losses are incalculable. For the fan blade, the repair of the lightning protection copper mesh offset is of great significance. SUMMARY

[0003] The present application overcomes the deficiencies of the prior art and provides a wind power blade lightning protection copper mesh offset repair method with reasonable design.

[0004] The present application is achieved by the following technical solutions: The present application discloses a wind power blade lightning protection copper mesh offset repair method, which realizes lightning protection and conduction in the area by adding a correction copper mesh at the position of the structure design copper mesh offset without damaging the structure design copper mesh. The wind power blade lightning protection copper mesh offset repair method specifically includes the following 8 steps: Step 1, positioning of the copper mesh offset area and treatment of the outer surface; Step 2, prefabrication and laying of the copper mesh connection assembly and the enhanced copper mesh; Step 3, laying of the correction copper mesh; Step 4, laying of the surface felt or other glass fiber fabric on the outer surface of the copper mesh; Step 5, arrangement of the surface auxiliary material, the pouring system and the air extraction system; Step 6, vacuum injection; Step 7, surface treatment of the repair area; and Step 8, connection of the copper mesh connection assembly with the main lightning protection line of the blade.

[0005] The specific steps of the positioning of the copper mesh offset area and the outer surface treatment are as follows: the repair area of the copper mesh offset is positioned, the repair area to be repaired includes the lightning arrester or the lightning wire branch, if the repair area to be repaired does not include the lightning arrester or the lightning wire branch, the repair area is continuously extended axially until the lightning arrester or the lightning wire branch is included; a polishing tool is used to roughen the outer surface of the positioned repair area, the structure design copper mesh cannot be damaged, and the roughened area ensures that the laying of the copper mesh is corrected to meet the process requirements.

[0006] The pre-preparation and laying of the copper mesh connecting assembly and the reinforced copper mesh specifically include the following steps: (1) processing the Z-shaped port of the connecting plate into an L-shaped port; (2) assembling the copper mesh connecting assembly and cutting the reinforced copper mesh according to the size and requirements of the original design of the blade; (3) placing the connecting plate assembly at a position 500 mm away from the lightning arrester or the lightning wire branch in the axial direction of the blade, polishing and cutting the outer surface of the blade before placing the connecting plate assembly to ensure that the connecting plate assembly is flush with the outer surface of the blade when placed; (4) covering multiple layers of glass fiber fabric on the connecting plate after the connecting plate assembly is placed; (5) the L-shaped port of the connecting plate assembly needs to be extended into the blade and expose the bolt hole, and be sealed; (6) laying the reinforced copper mesh above the copper mesh assembled on the connecting plate according to the design requirements of the blade.

[0007] The laying step of the corrected copper mesh is as follows: laying the corrected copper mesh in the repair area, the corrected copper mesh needs to completely cover the carbon beam, and the corrected copper mesh needs to be used as a whole and is not allowed to be spliced with two or more pieces.

[0008] In the laying of the surface felt or other glass fiber fabric on the outer surface of the copper mesh in step 4, multiple layers of surface felt or other glass fiber surface fabric allowed by the design of the blade are laid on the outer surface of the corrected copper mesh, and the surface felt or other glass fiber surface fabric needs to completely cover the corrected copper mesh.

[0009] In the arrangement of the surface auxiliary material, the pouring system and the air extraction system in step 5, release cloth, isolation film, flow guide net, glue pouring pipeline and air extraction pipeline are laid in the repair area, and are sealed and covered with a vacuum bag film, and a vacuum pump is used to extract air from the sealed area to form negative pressure.

[0010] In the vacuum pouring in step 6, after the negative pressure of the sealed area reaches a certain value, a resin system is introduced into the laying layer by using a vacuum pouring process, the resin system needs to completely infiltrate the laying layer, and an external heating device is used to heat the laying layer to ensure complete curing of the resin.

[0011] In the surface treatment process of the repair area in step 7, the auxiliary materials on the surface of the repair area are removed, and the outer surface of the repair area is processed, filled with putty and painted.

[0012] Considering the structural design of the blade, the structural design copper mesh is laid from the blade root to the blade tip to completely cover the carbon fiber carbon beam, and there are uncertain factors in the position where the structural design copper mesh deviates. Two kinds of copper mesh connection assemblies and the connection mode of the main lightning conductor of the blade are given. One is to connect the connection assembly with the main lightning conductor inside the blade, which is suitable for people to enter the inside of the blade to the work area and have enough space for work. Two is to connect the connection assembly with the main lightning conductor outside the blade, which is suitable for people who cannot work inside the blade.

[0013] In step 8, the connection assembly and the main lightning conductor of the blade are connected in the following two ways. One is to connect the connection assembly with the main lightning conductor inside the blade. Enter the inside of the blade, use a certain length of lightning conductor, terminal, bolt and nut, and wire clamp to effectively connect the "L" shaped port of the connection plate assembly with the lightning conductor branch of the blade. After connection, use a multimeter to test the resistance between the connection plate and the main lightning conductor of the blade, and the resistance value should be ≤50 mΩ, or the resistance value allowed by the blade design.

[0014] In step 8, the connection assembly and the main lightning conductor of the blade are connected in the following two ways. One is to connect the connection assembly with the main lightning conductor inside the blade. Enter the inside of the blade, use a certain length of lightning conductor, terminal, bolt and nut, and wire clamp to effectively connect the "L" shaped port of the connection plate assembly with the lightning conductor branch of the blade. After connection, use a multimeter to test the resistance between the connection plate and the main lightning conductor of the blade, and the resistance value should be ≤50 mΩ, or the resistance value allowed by the blade design.

[0015] The beneficial effects of the present application are: the technical problem to be solved by the present application is to provide a wind power blade lightning protection copper mesh deviation repair method with reasonable design, which specifically includes eight steps of positioning and outer surface treatment of the copper mesh deviation area, precasting and laying of the copper mesh connection assembly and the reinforced copper mesh, correcting the laying of the copper mesh, laying the surface felt or other glass fiber fabric on the outer surface of the copper mesh, arranging the surface auxiliary material, pouring system and air extraction system, vacuum guide injection, surface treatment of the repair area, and connecting the copper mesh connection assembly with the main lightning conductor of the blade. The repair method in the present application realizes lightning protection and conduction in the area by adding a correcting copper mesh at the position where the structural design copper mesh deviates without damaging the structural design copper mesh, so as to ensure that the wind power blade lightning protection copper mesh can have good conduction effect and lightning protection effect after repair. The repair method in the present application has the advantages of simple operation, low maintenance cost and high repair quality, and effectively reduces the cost of wind power blades. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1is a copper mesh repair schematic diagram of the lightning protection copper mesh offset repair method of the wind power blade of the present application;

[0017] Figure 2 is a connection schematic diagram of the copper mesh connection assembly and the lightning rod copper block of the wind power blade of the present application;

[0018] Figure 3 is a connection schematic diagram of the copper mesh connection assembly and the lightning rod copper block of the wind power blade of the present application;

[0019] In the figure: 1-root; 2-tip; 3-TE side; 4-LE side; 5-copper mesh offset area; 6-copper mesh connection assembly; 7-enhanced copper mesh; 8-carbon beam; 9-corrective copper mesh; 10-L port connecting plate; 11-connection cover; 12-structural design copper mesh; 13-blade; 14-lightning rod; 15-lightning rod screw; 16-flat port connecting plate; 17-lightning rod copper block. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be further described in detail below in combination with the drawings and specific embodiments, but do not constitute limitations or constraints on the present application. The various raw materials used in the following embodiments can be obtained through commercial channels.

[0021] The present application discloses a lightning protection copper mesh offset repair method for a wind power blade, as shown in Figure 1 The left side is the root 1, the right side is the tip 2, the upper side is the TE side 3, and the lower side is the LE side 4. The repair method is to realize lightning protection and conduction in the offset area by adding a corrective copper mesh 9 at the offset position of the structural design copper mesh 12 without damaging the structural design copper mesh 12. The repair method specifically includes the following 8 steps: Step 1, positioning and outer surface treatment of the copper mesh offset area 5; Step 2, prefabrication and laying of the copper mesh connection assembly 6 and the enhanced copper mesh 7; Step 3, laying of the corrective copper mesh 9; Step 4, laying of the surface felt or other fiberglass fabric on the outer surface of the copper mesh; Step 5, arrangement of surface auxiliary materials, pouring system and air extraction system; Step 6, vacuum injection; Step 7, surface treatment of the repair area; Step 8, connection of the copper mesh connection assembly 6 and the lightning rod 14 of the blade.

[0022] Embodiment one: a lightning protection copper mesh offset repair method for a wind power blade, as shown in Figure 2 The embodiment is suitable for connecting the copper mesh connection assembly 6 and the lightning rod 14 of the blade inside the blade 13, and the specific operation steps are as follows:

[0023] Step 1: positioning and outer surface treatment of the copper mesh offset area 5:

[0024] Position the copper mesh offset area 5, the area to be repaired contains the lightning arrester or lightning wire 14 branch line of the blade, if the area to be repaired does not contain the lightning arrester or lightning wire 14 branch line, continue to extend the repair area axially until it contains the lightning arrester or lightning wire 14 branch line of the blade; use a polishing tool to roughen the outer surface of the repair area that has been positioned, without damaging the structural design of the copper mesh 12; the roughened area must ensure that the laying of the correction copper mesh 9 meets the process requirements.

[0025] Step 2: Preparation and laying of the copper mesh connecting assembly 6 and the reinforcing copper mesh 7:

[0026] (1) Process the Z-shaped port of the connecting plate into an L-shaped port; (2) Assemble the copper mesh connecting assembly 6 and cut the reinforcing copper mesh 7 according to the original design size and requirements of the blade 13; (3) Place the connecting plate assembly 6 at a position 500 mm away from the lightning arrester or lightning wire 14 branch line of the blade 13 in the axial direction of the blade 13, and perform polishing and cutting on the outer surface of the blade 13 before placing the connecting plate assembly 6 to ensure that the connecting plate assembly 6 is flush with the outer surface of the blade 13 when placed; (4) After placing the connecting plate assembly 6, cover multiple layers of fiberglass fabric on the connecting plate; (5) The L-shaped port of the connecting plate assembly 6 should extend into the interior of the blade 13 and expose the bolt hole, and be sealed; (6) Lay the reinforcing copper mesh 7 above the copper mesh on the connecting plate according to the design requirements of the blade 13.

[0027] Step 3: Laying of the correction copper mesh 9:

[0028] Lay the correction copper mesh 9 in the repair area, which must completely cover the carbon beam 8, and the correction copper mesh 9 must be used in whole pieces, not in two or more pieces.

[0029] Step 4: Laying of surface felt or other fiberglass fabric on the outer surface of the copper mesh:

[0030] Lay multiple layers of surface felt or other surface fabric allowed by the blade design on the outer surface of the correction copper mesh 9, and the surface felt or other fabric must completely cover the correction copper mesh 9.

[0031] Step 5: Arrangement of surface auxiliary materials, pouring system and vacuum system:

[0032] Lay release cloth, isolation film, flow guide net, glue pouring pipeline, air extraction pipeline, etc. in the repair area, and seal and cover with vacuum bag film, and use a vacuum pump to extract air from the sealed area to form negative pressure.

[0033] Step 6: Vacuum infusion:

[0034] After the negative pressure of the sealed area reaches a certain value, use the vacuum infusion process to introduce the resin system into the above-mentioned layers, and the resin system must completely infiltrate the layers; use external heating equipment to heat the layers to ensure complete curing of the resin.

[0035] Step 7: Surface treatment of the repair area:

[0036] Remove the auxiliary materials on the surface of the repair area, process the outer surface of the repair area, fill the putty, and paint the repair area.

[0037] Step 8: Connect the copper mesh connection assembly 6 with the blade main lightning conductor 14:

[0038] Enter the inside of the blade 13, use a certain length of lightning conductor 14, wiring terminal, bolt and nut, and wire clamp to effectively connect the L-shaped port of the connection plate assembly 6 with the branch of the blade lightning conductor 14. After connection, use a multimeter to test the resistance between the connection plate and the blade main lightning conductor 14, and the resistance value should be ≤50 milliohms, or the resistance value allowed by the blade 13 design.

[0039] Example Two: A repair method for the offset of the lightning copper mesh of a wind turbine blade, as shown in FIG. 2, this example is applicable to the connection between the copper mesh connection assembly 6 and the blade main lightning conductor 14 outside the blade 13, and the specific operation steps are as follows: Figure 3

[0040] Step 1: Positioning and surface treatment of the copper mesh offset area 5:

[0041] Position the repair area of the copper mesh offset, and the area to be repaired should include the lightning arrester of the blade 13. If the area to be repaired does not include the lightning arrester, continue to extend the repair area axially until it includes the lightning arrester of the blade. Use a polishing tool to roughen the outer surface of the positioned repair area, and do not damage the structure design copper mesh 12. The roughened area should ensure that the laying of the corrected copper mesh 9 meets the process requirements.

[0042] Step 2: Preparing and laying the copper mesh connection assembly 6 and the reinforced copper mesh 7:

[0043] (1) Process the Z-shaped port of the connection plate into a flat port.

[0044] (2) Align the flat port bolt hole of the flat port connection plate 16 with the center position of the lightning arrester, and measure the distance b from the connection plate to the front edge of the corrected copper mesh 9.

[0045] (3) According to the measured value b and the blade 13 design processing, assemble the copper mesh connection assembly 6 and cut the reinforced copper mesh 7.

[0046] ​(4) Place the connecting plate assembly 6 at the blade lightning arrester position, and the flat port bolt hole of the flat port connecting plate 16 is completely coincident with the center of the lightning arrester; (5) Before placing the connecting plate assembly 6, polish and cut the outer surface of the blade 13 to ensure that the connecting plate assembly 6 is flush with the outer surface of the blade 13 when placed; (6) After placing the connecting plate assembly 6, cover the connecting plate with multiple layers of glass fabric: (7) According to the design requirements of the blade 13, lay the reinforcing copper mesh 7 above the copper mesh assembly.

[0047] Step 3: Correction of copper mesh 9 laying:

[0048] Lay the correction copper mesh 9 in the repair area, which completely covers the carbon beam 8. The correction copper mesh 9 requires whole piece use, and is not allowed to be spliced with two or more pieces.

[0049] Step 4: Laying of surface felt or other glass fabric on the outer surface of the copper mesh:

[0050] Lay multiple layers of surface felt or other surface fabric allowed by the design of the blade 13 on the outer surface of the correction copper mesh 9. The surface felt or other fabric completely covers the correction copper mesh 9.

[0051] Step 5: Arrangement of surface auxiliary materials, pouring system and air extraction system:

[0052] Lay release cloth, isolation film, flow guide net, glue injection pipeline, air extraction pipeline, etc. in the repair area, and seal and cover with vacuum bag film. Use a vacuum pump to extract air from the sealed area to form negative pressure.

[0053] Step 6: Vacuum injection:

[0054] After the negative pressure of the sealed area reaches a certain value, the resin system is introduced into the above-mentioned laying layer by vacuum pouring process. The resin system completely infiltrates the laying layer. External heating equipment is used to heat the laying layer to ensure complete curing of the resin.

[0055] Step 7: Surface treatment of the repair area:

[0056] Remove the auxiliary materials on the surface of the repair area, and process, fill putty and paint the outer surface of the repair area.

[0057] Step 8: Connection of the copper mesh connecting assembly 6 and the blade main lightning line 14;

[0058] The flat port of the connecting plate is polished out by using a polishing tool outside the blade 13, drilling is performed on the bolt hole of the flat port of the connecting plate by using a drill bit, it is ensured that the drilling passes through the lightning receptor copper block 17 inside the blade 13, the lightning receptor hole is threaded by using a tool, finally, the lightning receptor screw 15 is installed, and the lightning receptor screw 15 ensures effective connection between the copper mesh connecting plate and the lightning receptor copper block 17. After connection, the resistance between the connecting plate and the main lightning wire 14 of the blade is tested by using a multimeter, and the resistance value is required to be ≤50 mΩ, or the resistance value allowed by the blade 13 design.

[0059] Finally, it should be noted that the above content is only used to illustrate the technical solutions of the present application, and is not a limitation on the protection scope of the present application. Simple modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art do not deviate from the essence and scope of the technical solutions of the present application.

Claims

1. A method of repairing a lightning copper mesh offset of a wind turbine blade, characterized in that: The repair method is to realize lightning protection and conduction of the area by adding a correction copper mesh at the position deviated from the structural design copper mesh without destroying the structural design copper mesh; the repair method of the wind power blade lightning protection copper mesh deviation specifically comprises the following eight steps: step 1, positioning of the copper mesh deviation area and treatment of the outer surface; step 2, pre-preparation and laying of the copper mesh connecting assembly and the reinforcing copper mesh; step 3, laying of the correction copper mesh; step 4, laying of the surface felt or other glass fiber fabric on the outer surface of the copper mesh; step 5, arrangement of the surface auxiliary material, the pouring system and the air extraction system; step 6, vacuum guiding and pouring; step 7, surface treatment of the repair area; and step 8, connection of the copper mesh connecting assembly with the main lightning protection line of the blade; The specific steps of the step 1, positioning of the copper mesh deviation area and treatment of the outer surface, are as follows: the repair area of the copper mesh deviation is positioned, the area to be repaired contains a blade lightning protection arrester or a lightning protection line branch line, if the area to be repaired does not contain the lightning protection arrester or the lightning protection line branch line, the repair area needs to be continuously extended axially until the blade lightning protection arrester or the lightning protection line branch line is contained; a polishing tool is used to roughen the outer surface of the positioned repair area, the structural design copper mesh cannot be damaged, and the roughened area ensures that the laying of the correction copper mesh meets the process requirements; The step 2, pre-preparation and laying of the copper mesh connecting assembly and the reinforcing copper mesh, specifically comprises the following steps: (1) the Z-shaped port of the connecting plate is processed into an L-shaped port; (2) the copper mesh connecting assembly is assembled and the reinforcing copper mesh is cut according to the size and requirements of the original design of the blade; (3) the connecting plate assembly is placed at a position 500 mm away from the blade lightning protection arrester or the lightning protection line branch line in the axial direction of the blade, the outer surface of the blade is polished and cut before the connecting plate assembly is placed, and the connecting plate assembly is placed flush with the outer surface of the blade; (4) after the connecting plate assembly is placed, multiple layers of glass fiber fabric need to be covered on the connecting plate; (5) the L-shaped port of the connecting plate assembly needs to be stretched into the blade and expose the bolt hole, and be sealed; (6) the reinforcing copper mesh is laid on the copper mesh above the connecting plate assembly according to the design requirements of the blade; The step 3, laying of the correction copper mesh, is as follows: the correction copper mesh is laid in the repair area, the correction copper mesh needs to completely cover the carbon beam, and the correction copper mesh requires to be used as a whole and is not allowed to be used by splicing two or more pieces; In the step 4, laying of the surface felt or other glass fiber fabric on the outer surface of the copper mesh, multiple layers of surface felt or other glass fiber surface fabric allowed by the design of the blade are laid on the outer surface of the correction copper mesh, and the surface felt or other glass fiber surface fabric needs to completely cover the correction copper mesh; In the step 5, arrangement of the surface auxiliary material, the pouring system and the air extraction system, release cloth, isolation film, flow guide net, glue pouring pipeline and air extraction pipeline are laid in the repair area, and are sealed and covered with a vacuum bag film, a vacuum pump is used to extract air from the sealed area to form negative pressure; In the step 6, vacuum guiding and pouring, after the negative pressure of the sealed area reaches a certain value, a resin system is introduced into the laying layer by using a vacuum pouring process, the resin system completely infiltrates the laying layer, external heating equipment is used to heat the laying layer to ensure complete curing of the resin; The step 7 repair area surface treatment process: remove the repair area surface auxiliary material, the repair area surface processing, putty and paint treatment; The step 8 copper net connection assembly and blade main lightning wire connection step: in the blade inside, the connecting assembly is connected with the main lightning wire, enters the blade inside, uses certain length lightning wire, terminal, bolt and nut, and wire clamp to effectively connect the L-shaped port of the connecting plate assembly with the blade lightning wire branch, after connection, uses the multimeter to test the resistance between the connecting plate and the blade main lightning wire, and the resistance value is required to be less than or equal to 50 milliohm, or the resistance value allowed by the blade design.

2. The method of repairing a lightning copper mesh offset of a wind turbine blade according to claim 1, characterized in that: The step 8 copper net connection assembly and blade main lightning wire connection step: in the blade outside, the connecting assembly is connected with the main lightning wire, in the blade outside, the flat port of the connecting plate is polished and exposed by using polishing tools, drilling is carried out on the bolt hole of the flat port of the connecting plate by using a drill bit, the through hole of the blade inside is ensured to be drilled through the copper block of the lightning arrester, the hole of the lightning arrester is tapped by using tools, and finally the lightning arrester screw is installed, the lightning arrester screw ensures that the copper net connecting plate and the copper block of the lightning arrester are effectively connected, after connection, the multimeter is used to test the resistance between the connecting plate and the blade main lightning wire, and the resistance value is required to be less than or equal to 50 milliohm or the resistance value allowed by the blade design.

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