Wind Turbine Blade Replacement Device Using Segmented Top and Ground Elements
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Solution Overview
Problem
The high cost and logistical challenges of using large cranes for mounting and dismounting wind turbine blades, particularly in inaccessible locations, necessitate a more efficient and cost-effective solution for blade maintenance and installation.
Innovation Solution
A device comprising two elements, a 'top' element with pulley systems and fastening mechanisms, and a 'ground' element with winches and deviation pulleys, allowing for adjustable fitting to different turbine and blade sizes, and incorporating an inclinometer and counterweights to manage blade inclination and weight, preventing rotation and flipping during operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If large cranes are used for mounting and dismounting wind turbine blades, then the blades can be handled with sufficient capacity, but the cost and logistical complexity increase significantly
Solution Approach 1:
The device is divided into two separate elements: a top element that attaches to the blade and a ground element that remains at the tower base. This segmentation eliminates the need for a single complex crane system, replacing it with simpler, distributed components that work together through cables and pulleys.
Solution Approach 2:
Cables and pulleys serve as intermediaries between the ground element and the blade. The cables transmit force from the ground-based winches to the top element attached to the blade, enabling lifting and positioning operations without requiring direct mechanical contact from a large crane.
2Reliability
If large cranes are used for blade maintenance, then the blades can be safely handled, but the cost of installation and maintenance increases notably
Solution Approach 1:
The system enables self-service maintenance operations by providing a dedicated blade replacement device that can be deployed directly at the turbine site. The ground element with winches and the top element with fastening mechanisms work together to safely handle blade removal and installation without requiring external crane support.
Solution Approach 2:
The blade replacement device uses simpler, more cost-effective components compared to large cranes. The system employs standard winches, cables, and pulley mechanisms that are less expensive to manufacture and deploy, making blade maintenance more economically viable.
3Adaptability or versatility
If cranes are transferred to inaccessible wind turbine sites, then blade replacement can be performed, but the operation becomes virtually impossible without conditioned accesses
Solution Approach 1:
The ground element is designed to be adaptable to different tower configurations and site conditions. The system can accommodate various tower diameters and access conditions, making it universally applicable across different wind farm locations without requiring specialized crane equipment for each site.
Solution Approach 2:
Instead of bringing heavy crane equipment to the turbine site, the system inverts the approach by keeping the main machinery (winches and control systems) at the ground level and using cables to reach the blade. This eliminates the need to transport and position large cranes on inaccessible terrain.
4Ease of operation
If a winch inside the hub is used for blade hoisting, then the blade can be lowered vertically and rotated, but a large amount of space is needed in the hub
Solution Approach 1:
The winch mechanism is extracted from the hub and relocated to the ground element. This removes the space-consuming winch, retention systems, and rotation-proof mechanisms from the hub, leaving the hub structure compact and preserving its original design integrity while maintaining all necessary blade handling functions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables safe and efficient mounting and dismounting of wind turbine blades with reduced costs and logistical complexities, suitable for various wind farm sites and climate conditions, while ensuring reliable blade alignment and weight management.
Implementation Method 1
The upper element of the device, which will be referred to hereinafter as 'top' (1), consists of some pulley elements and some means for fastening the blade
Implementation Method 2
The lower element, which will be referred to hereinafter as 'ground' (2), consists of a structure that encompasses the wind turbine tower and is equipped with at least two winches and two deviation pulleys
Implementation Method 3
as well as the load cells that measure the weight withstood by compression, and counterweights that counteract the blade's weight
Data Source
AI summary
Method and device for replacing a blade (13) in wind turbines that comprises two elements, one upper (1) and the other lower (2) that work together to raise and/or lower the blade (13) of a wind turbine. The device's upper element or “top” (1) comprises some elements (4) bolted to the bearing (3) of the wind turbine and some means of fastening (5) the blade (13), while the lower element or “ground” (2) is a structure that encompasses the wind turbine tower (8) and has at least two winches (2.5) and two deviation pulleys (2.4) to connect some cables (6) between the device elements, namely the “top” (1) and “ground” (2).