Lifting Straps for Wind Turbine Blades
The lifting straps for lifting wind turbine blades is a special flexible sling designed for the lifting needs of wind turbine blades (usually 20-80 meters in length, 5-30 tons in weight, and mostly made of glass fiber reinforced plastic FRP). Its core function is to achieve smooth lifting during the transportation and installation of the blades while avoiding damage to the blade surface (easy to scratch) and internal structure (brittle material).
Key technical features (optimized for fan blade hoisting scenarios)
Flexible contact, zero damage protection
The main body of the sling is made of fiber material, with a soft surface and no hard edges and corners. It will not scratch when in contact with the fan blade (scratches on the FRP surface may cause stress concentration and affect the service life); the wide design disperses the pressure to prevent the fan blade from cracking due to local pressure (especially the weak parts such as the edge of the fan blade and the transition zone of the curved surface).
Balance of high strength and low elongation
Using high modulus fiber (such as aramid), the elongation is ≤1% under the rated load to ensure the stability of the fan blade posture during hoisting (no "falling" or "shaking"), which is especially suitable for the precise alignment requirements of offshore wind turbine fan blades (there are wind and waves in the hoisting environment).
Customized design for large-size fan blades
Customizable length: According to the spacing of the fan blade hoisting points (usually 2-4 hoisting points are set along the length of the fan blade), the length error of the sling is controlled within ±50mm to ensure uniform force;
End connection adaptation: The end metal accessories (hanging rings, hooks) are made of high-strength alloy (such as 42CrMo), tempered (hardness HRC28-32), and anti-corrosion coating (zinc-nickel alloy plating, salt spray resistance ≥1000 hours), suitable for crane hooks or special balance beams.
Weather resistance and environmental adaptability
Ultraviolet resistance: The fiber is treated with UV stabilizer, and the strength decay is ≤10% within 5 years under outdoor exposure (annual radiation ≤150kWh/m²);
Chemical corrosion resistance: It can withstand the erosion of seaside salt spray (concentration ≤5%) and industrial dust (such as sulfide), suitable for onshore and offshore wind power scenarios
Applicable scenarios:
Fan blade production plant: lift the finished fan blade from the mold to the storage rack;
Transportation: lift the fan blade from the factory to a special transport vehicle (such as an extra-long flatbed truck), or lift it from the transport vehicle to the wind power installation platform;
Wind power site: lift the fan blade to the top of the tower and dock it with the hub for installation (especially offshore wind power, which requires precise operation with a crane ship).