A method for installing a lightning protection system for wind turbine blades

Abstract

The present invention relates to a method for installing a lightning protection system for a wind turbine blade, which is characterized by comprising the following steps: marking a small core material square at a required position on the blade suction surface; aligning the marked position with a φ30mm circular hole; installing the lightning protection system aluminum plate: bonding the lightning receptor aluminum plate with a threaded bottom hole to the lower follow-up PVC block, using a positioning tool to align the aluminum plate, and hand-paste the aluminum plate to strengthen it; finally installing the aluminum column: applying a layer of conductive paste on the threaded part of the aluminum column, screwing it into the threaded hole of the aluminum plate, and circulating it after detecting the qualified resistance. The operation method is simple, and the aluminum plate with holes for the lightning protection system is installed in advance, which is both economical and safe and reliable, improves the installation efficiency of the blade lightning protection system, and can reduce the number of post-processing punching operators, with high labor efficiency.

Description

Technical Field

[0001] The invention relates to a method for installing a lightning protection system for a wind turbine blade, and belongs to the field of wind turbine blades. Background Art

[0002] In recent years, with the vigorous development of wind power energy, the models of wind turbine blades are getting larger and larger. The lightning protection system of wind turbine blades is a key system to ensure that the blades are protected from lightning strikes. However, at present, the aluminum plates of the lightning protection system are pre-buried inside the blades in advance. In the post-processing stage of the blades, a magnetic drill is used to punch holes in the magnesium-aluminum alloy aluminum plate with a thickness of about 25mm. After manual tapping, the aluminum rods of the lightning protection system are installed. Because the tools are heavy, the entire operation requires two or more employees to operate, and it takes a long time, which does not conform to the production concept of improving efficiency and refined management, and it is increasingly difficult to meet current production needs. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the present invention provides a method for installing a lightning protection system for wind turbine blades.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a method for installing a lightning protection system for wind turbine blades, characterized in that it includes the following steps:

[0005] a. Locate the installation position of the aluminum plate: At the required position of the blade suction surface, cut a small core material block of 30mm*30mm, mark it on the upper and lower surfaces and refill it into the square hole of the core material. The error of the marking position in the span direction (axial direction of the blade) is ±20mm, and the error in the chord direction (radial direction of the blade) is ±3mm;

[0006] b. Drilling: After the blade is poured and solidified, keep the demoulding cloth, remove other auxiliary materials on the suction surface of the blade, find the position marked in step a, and drill a φ30mm circular hole at the marked position; after drilling, clean up the core material debris in the hole, and ensure that the span and chord errors of the drilling are ±2mm respectively;

[0007] c. Install the aluminum plate of the lightning protection system: apply a layer of structural glue around the round hole, and be careful not to apply structural glue inside the round hole. Glue the lower follow-up PVC block here, with the hole on the lower follow-up PVC block corresponding to the above round hole. Then glue the lightning receptor aluminum plate with threaded bottom hole to the lower follow-up PVC block, so that the threaded bottom hole corresponds to the above round hole. Keep the lightning receptor aluminum plate aligned with the lower follow-up PVC block, and control the installation error within ±1mm; use a special positioning fixture, and use the positioning column of the positioning fixture to vertically pass through the threaded bottom hole of the lightning receptor aluminum plate, the hole on the lower follow-up PVC block and the round hole of the core material in turn, guide the lightning receptor aluminum plate, cure the lightning receptor aluminum plate for a period of time to fix it, remove the positioning fixture, cover the threaded hole of the lightning receptor aluminum plate with a follow-up PVC block, and use 1000g / ㎡ biaxial glass fiber cloth soaked in hand-layup resin to hand-lay up the lightning protection system aluminum plate.

[0008] d. Install the aluminum column of the lightning protection system: After the blades are molded, the mold is solidified and removed for post-processing. A φ30mm round hole is opened at the mark on the suction surface of the blade. The pressure surface is opened from the suction surface to the pressure surface. The burrs in the hole are trimmed. The aluminum plate of the lightning receptor is manually tapped. A layer of conductive paste is applied to the threaded part of the aluminum column. Two layers of aluminum foil are wrapped around it. The aluminum column is screwed into the threaded hole of the aluminum plate. The resistance is tested and it is circulated after passing the test.

[0009] The lower follow-up PVC block is an irregular vertical surface with an inclined bottom surface that matches the blade, a flat surface with a through hole that corresponds to the threaded bottom hole on the aluminum plate; the upper follow-up PVC block is a vertical surface with unequal thickness on both sides.

[0010] The positioning tooling is as follows: a top plate is provided at the top of the positioning sleeve, a pair of side ears are symmetrically provided on both sides of the top plate, and a circular hole A is provided on the side ears; a base is provided at the upper end of the positioning pin, the positioning pin is inserted into the positioning sleeve and fixed with a latch II, and the base is aligned with the top plate; the left and right connecting rods are inserted from the base and the top plate in turn, and then inserted between the side ears, fixed with a latch I, the top of the connecting rod is fixed to the base with a butterfly nut and a gasket, and the end of the connecting rod is clamped with a retaining spring; a column is also provided in the middle above the base, the right side of the column is connected to the crossbeam, and a positioning column is provided below the end of the crossbeam; fixed plates are provided on the front and back sides of the lower half of the positioning sleeve, and the right side of the fixed plate is fixed to the mold truss.

[0011] A circular hole B is provided at the lower part of the positioning pin, and a corresponding circular hole is also provided at the front of the positioning sleeve. The positioning pin is inserted into the positioning sleeve and fixed by inserting a pin II into the circular hole.

[0012] The top plate and the base are both provided with notches, a round hole is provided at the lower part of the connecting rod, the connecting rod is passed through the notch, and then inserted between the side ears, fixed with a latch I, and the end of the latch I is clamped with a retaining spring.

[0013] Two waist holes are arranged on the left side of the fixing plate, and two threaded holes are arranged on the front and rear surfaces of the lower half of the positioning sleeve. The fixing plate and the positioning sleeve are fixed by passing bolts through the waist holes and the threaded holes.

[0014] The latch pin II is connected with a steel wire rope, and the steel wire rope is connected to the fixing plate.

[0015] The method for using the positioning tool is as follows: the blade mold is placed on the mold truss, two fixing plates are welded on the vertical beam on the left side of the mold truss, the positioning sleeve is placed between the two fixing plates and fixed with bolts, and the pin II is inserted at the same time to ensure that the positioning tool does not rotate; the connecting rod is fixed with the pin I and tightened with the butterfly nut to make the column stable, and the positioning column under the end of the crossbeam connected to the right side of the column is inserted into the corresponding circular hole to ensure that multiple circular holes are concentric, and the aluminum plate of the lightning arrester is guided.

[0016] The beneficial effects of the present invention are as follows: the operation method is simple, and the aluminum plate of the lightning protection system with holes is installed in advance, which is both economical and safe and reliable, improves the installation efficiency of the blade lightning protection system, and can reduce the number of post-processing drilling operators, with high labor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the installation of the present invention;

[0018] Figure 2 This is a front view of the positioning tool of the present invention;

[0019] Figure 3 This is a left view of the positioning tool of the present invention;

[0020] Figure 4 This is a schematic diagram of the positioning pin of the present invention;

[0021] Figure 5 This is a schematic diagram of a free-standing PVC block according to the present invention;

[0022] Figure 6 This is a schematic diagram of the free-standing PVC block of the present invention;

[0023] In the figure: 1-positioning sleeve, 2-top plate, 3-side ear, 4-round hole A, 5-pin I, 6-positioning pin, 6-1 round hole B, 7-base, 8-connecting rod, 9-butterfly nut, 10-spacer, 11-pin II, 12-threaded hole, 13-fixing plate, 14-waist hole, 15-wire rope, 16-circlip, 17-column, 18-crossbeam, 19-positioning column, 20-bolt. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] Example 1, see Figure 1-6 ,

[0026] A method for installing a wind turbine blade lightning protection system, characterized in that it comprises the following steps:

[0027] (1) Process the mold according to the normal operating procedures, lay the demoulding cloth, two layers of fiberglass outer skin cloth, lay the blade root reinforcement layer, place the main beam, and lay the core material;

[0028] (2) After the core material is laid, remove a 30mm*30mm core material block at the specified position on the blade suction surface according to the design requirements, mark the upper and lower surfaces, and re-fill the core material block into the 30mm*30mm core material square hole to mark the installation position of the lightning arrester aluminum plate. The spanwise error of the marking position is ±20mm, and the chordwise error is ±3mm.

[0029] (3) After marking, lay the blade root reinforcement layer glass fiber cloth, two layers of glass fiber inner skin cloth, demoulding cloth, isolation film, guide net, arrange the injection pipeline, overlap the air bridge, put on two sets of vacuum bags, and after vacuuming and pressure maintenance, perform blade injection;

[0030] (4) After the blade is poured and the curing process is completed, only the demoulding cloth on the inner skin is retained, and the auxiliary materials on other blades are removed. The marked position of the aluminum plate installation of the lightning protection system can be clearly seen. Use a φ30mm hole opener to align the marked position to open a hole, penetrate the inner skin and the lower PVC block, and clean the core material debris in the hole. The span and chord errors of the hole are ±2mm respectively;

[0031] (5) Apply a layer of structural adhesive around the surface of the opened hole. Be careful not to apply structural adhesive inside the hole. Use a bottom-adaptable PVC block to bond it at this position, and align the hole on the bottom-adaptable PVC block with the opened hole. Apply structural adhesive on the bonded bottom-adaptable PVC block, and bond the flash detector aluminum plate with the threaded bottom hole. Keep the flash detector aluminum plate aligned with the bottom-adaptable PVC block. The installation error between the flash detector aluminum plate hole and the above hole is ±3mm. Use the positioning column of a special positioning tool to vertically pass through the aluminum plate hole, the hole on the bottom-adaptable PVC block, and the core material hole to guide the lightning detector aluminum plate. After curing for a period of time, when the lightning detector aluminum plate does not shake, remove the positioning tool, cover the hole of the lightning detector aluminum plate with a layer of top-adaptable PVC, and use 1000g / ㎡ biaxial glass fiber cloth soaked in hand-layup resin to hand-lay up and reinforce the lightning protection system aluminum plate;

[0032] (6) After the blade is molded, solidified and molded, it enters post-processing. Use a φ30mm hole opener to align the blade suction surface mark to open a hole. The spanwise and chordwise errors of the hole are ±2mm respectively. After opening the hole, clean the impurities in the hole, and use a special twist drill to open the pressure surface from the suction surface to the pressure surface. Use a straight grinder to expand the hole and trim the burrs in the hole. The spanwise and chordwise errors of the hole are ±2mm respectively. Use a tap to manually tap the aluminum plate of the lightning arrester;

[0033] (8) Apply a layer of conductive paste on the threaded part of the lightning protection system aluminum column, then wrap it with two layers of aluminum foil, screw the lightning protection system aluminum column into the threaded hole of the aluminum plate of the lightning arrester, test the resistance, and circulate it after it passes the test.

[0034] The method for using the positioning tool is as follows: the blade mold is placed on the mold truss, two fixing plates 13 are welded on the vertical beam on the left side of the mold truss, the positioning sleeve 1 is placed between the two fixing plates 13 and fixed with bolts 20, and the pin II 11 is inserted at the same time to ensure that the positioning tool does not rotate; the connecting rod 8 is fixed with the pin I 5 and tightened with the butterfly nut 9 to make the column 17 stable, and the positioning column 20 under the end of the cross beam 18 connected to the right side of the column 17 is inserted into the corresponding circular hole to ensure that multiple circular holes are concentric and the aluminum plate of the lightning arrester is guided.

[0035] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Those familiar with the technology may modify or improve the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for installing a wind turbine blade lightning protection system, characterized in that: The following steps are involved: a. Locate the installation position of the aluminum plate: At the required position of the blade suction surface, cut a small square of core material with a size of 30mm*30mm, mark the upper and lower surfaces, and then refill it into the square hole of the core material; b. Drilling: After the blade is poured and solidified, keep the demoulding cloth, remove the auxiliary materials on the suction surface of the other blades, find the position marked in step a, and drill a φ30mm circular hole at the marked position; c. Install the aluminum plate of the lightning protection system: glue the lower PVC block on the opened circular hole, and the hole on the lower PVC block corresponds to the above circular hole. Then glue the aluminum plate of the lightning receptor with the threaded bottom hole on the lower PVC block, so that the threaded bottom hole corresponds to the above circular hole. Keep the aluminum plate of the lightning receptor aligned with the lower PVC block. Use a special positioning tool to use the positioning column (19) of the positioning tool to vertically pass through the threaded bottom hole of the aluminum plate of the lightning receptor, the hole on the lower PVC block and the circular hole of the core material in sequence, guide the aluminum plate of the lightning receptor, cure the aluminum plate of the lightning receptor for a period of time to fix it, remove the positioning tool, cover the threaded bottom hole of the aluminum plate of the lightning receptor with the PVC block, and use 1000g / ㎡ biaxial glass fiber cloth soaked in hand lay-up resin to hand-lay up the aluminum plate of the lightning receptor; d. Install the aluminum column of the lightning protection system: After the blades are molded, solidify and demold, enter the post-processing, align the suction surface mark of the blade to open a φ30mm round hole, open the pressure surface from the suction surface to the pressure surface, trim the burrs in the hole, manually tap the aluminum plate of the lightning receptor, apply a layer of conductive paste on the threaded part of the aluminum column, and then wrap it with two layers of aluminum foil. Screw the aluminum column into the threaded hole of the aluminum plate of the lightning receptor, test the resistance, and circulate it after passing the test.

2. A method for installing a lightning protection system for wind turbine blades as claimed in claim 1, characterized in that The positioning tooling comprises: a top plate (2) is provided at the top of the positioning sleeve (1), a pair of side ears (3) are symmetrically provided on both sides of the top plate (2), and a circular hole A (4) is provided on the side ears (3); a base (7) is provided at the upper end of the positioning pin (6), the positioning pin (6) is inserted into the positioning sleeve (1) and fixed by a latch II (11), and the base (7) and the top plate (2) are aligned; left and right connecting rods (8) are inserted from the base (7) and the top plate (2) in sequence, and then inserted between the side ears (3), and fixed by a latch I (5), and the top of the connecting rod (8) is fixed to the base (7) by a butterfly nut (9) and a pad (10); a column (17) is also provided in the middle of the top of the base (7), the right side of the column (17) is connected to the cross beam (18), and a positioning column (19) is provided below the end of the cross beam (18); a fixing plate (13) is provided on the front and rear sides of the lower half of the positioning sleeve (1), and the right side of the fixing plate (13) is fixed to the mold truss.

3. A method for installing a lightning protection system for wind turbine blades as claimed in claim 1, characterized in that The method for using the positioning tool is as follows: the blade mold is placed on the mold truss, two fixing plates (13) are welded to the vertical beam on the left side of the mold truss, the positioning sleeve (1) is placed between the two fixing plates (13) and fixed with bolts (20), and the latch pin II (11) is inserted at the same time to ensure that the positioning tool does not rotate; the connecting rod (8) is fixed with the latch pin I (5) and tightened with the butterfly nut (9) to make the column (17) stable, and the positioning column (20) under the end of the cross beam (18) connected to the right side of the column (17) is inserted into the corresponding circular hole to ensure that the multiple circular holes are concentric, and the aluminum plate of the lightning arrester is guided.

4. A method for installing a lightning protection system for wind turbine blades as claimed in claim 1, characterized in that: The lower follow-up PVC block is an irregular vertical surface with an inclined bottom surface that matches the blade, a flat surface with a through hole that corresponds to the threaded bottom hole on the aluminum plate; the upper follow-up PVC block is a vertical surface with unequal thickness on both sides.

5. A method for installing a lightning protection system for wind turbine blades as claimed in claim 2, characterized in that The lower part of the positioning pin (6) is provided with a circular hole B (6-1), and the front side of the positioning sleeve (1) is also provided with a corresponding circular hole. The positioning pin (6) is inserted into the positioning sleeve (1) and fixed by inserting the plug II (11) into the circular hole.

6. A method for installing a wind turbine blade lightning protection system according to claim 2, characterized in that: The top plate (2) and the base (7) are provided with notches on both sides, and a circular hole is provided at the lower part of the connecting rod (8). The connecting rod (8) is inserted through the notch and then inserted between the side ears (3) and fixed by a latch I (5).

7. A method for installing a wind turbine blade lightning protection system according to claim 2, characterized in that: The fixing plate (13) has two waist holes (14) on the left side, and the positioning sleeve (1) has two threaded holes (12) on the front and rear sides of the lower half. The fixing plate (13) and the positioning sleeve (1) are fixed by bolts (20) passing through the waist holes (14) and the threaded holes (12).

8. A method for installing a lightning protection system for wind turbine blades as claimed in claim 2, characterized in that: the plug II (11) is connected with a steel wire rope (15), and the steel wire rope (15) is connected to the fixing plate (13).

Images