Wind Turbine Rotor Blade Handling Device with Pivotable Lever Arms
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Solution Overview
Problem
The assembly of wind turbine rotor blades is time-consuming and costly due to the large size and weight of modern wind turbines, requiring expensive equipment and labor, and is complicated by wind gusts affecting blade positioning during lifting and alignment.
Innovation Solution
A handling device and lifting system that efficiently grips, lifts, and orients wind turbine rotor blades using a frame with pivotable lever arms and flexible coupling members, allowing for self-adaptive gripping forces and independent rotational adjustments to align the blades with the hub, reducing the need for manual alignment and minimizing exposure to wind forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cranes and manual handling methods are used to lift and align rotor blades, then the blades can be mounted to the hub, but the assembly time and costs increase significantly due to the large size and weight of modern wind turbines
Solution Approach 1:
The handling device is divided into separate functional modules: a gripping mechanism with jaws, a lifting mechanism with chains, and an alignment mechanism with adjustable positioning elements. This segmentation allows each module to be optimized independently and enables the device to handle the complex task of blade mounting more efficiently
Solution Approach 2:
The invention introduces a specialized handling device as an intermediary between the crane and the rotor blade. This intermediary device includes a gripping mechanism that securely holds the blade, a lifting mechanism that raises it, and an alignment mechanism that positions it correctly, thereby simplifying the overall process
2Reliability
If the rotor blade is lifted into assembly position using conventional methods, then the blade can be mounted to the hub, but wind gusts significantly affect the blade position and alignment during the process
Solution Approach 1:
The alignment mechanism includes preliminary positioning features such as alignment guides and positioning pins that are engaged before the blade is fully lifted into position. These features counteract the disruptive effect of wind gusts by establishing a reference framework that maintains positioning accuracy throughout the lifting process
Solution Approach 2:
The handling device incorporates dynamic adjustment capabilities, allowing the alignment mechanism to adapt to changing wind conditions in real-time. The device can adjust the positioning elements dynamically to compensate for wind-induced movements, maintaining reliable blade positioning accuracy
3Productivity
If the rotor blade is aligned manually before fastening to the hub, then the bolts can be inserted, but substantial time losses occur due to the need for precise alignment and avoiding damage to the composite structure
Solution Approach 1:
The alignment mechanism performs preliminary alignment actions automatically during the lifting process. Positioning guides and alignment features are engaged to pre-position the blade root section relative to the hub, eliminating the need for time-consuming manual alignment operations while ensuring precise positioning
Solution Approach 2:
The handling device includes self-aligning features such as tapered positioning elements and automated alignment mechanisms that automatically adjust to achieve the correct alignment. This self-service capability eliminates the need for manual alignment operations and reduces the time required for precise positioning
4Productivity
If expensive work equipment and manual handling are used for blade mounting, then the blades can be handled safely, but the assembly period becomes a significant cost factor
Solution Approach 1:
The invention merges multiple functions into a single integrated handling device: gripping, lifting, and alignment capabilities are combined in one device. This integration eliminates the need for multiple separate operations and equipment, significantly reducing the assembly period while maintaining safety
Solution Approach 2:
The handling device enables continuous operation by seamlessly transitioning through gripping, lifting, and alignment actions without interruption. The automated sequence of operations eliminates idle time between steps, making the assembly process more efficient and reducing the overall assembly period
Data Source
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AI summary
A device (100, 1001, 1002) for handling a rotor blade (22) of a wind turbine (10) is provided. The device (22) includes a frame (110) which defines an inner space (105) for at least partially accommodating the rotor blade (22). The device (100, 1001, 1002) further includes a blade support (172, 173) which is arranged in the inner space (105) and mounted to the frame (110), and a first lever arm (150). The first lever arm (150) is pivotably mounted to the frame (110) and includes a retaining end (153) arranged in the inner space (105) and an actuator end (154) which is movable to rotate the first lever arm (150) so that the rotor blade (22) is retained between the blade support and (172, 173) the clamping end (154).