Modular Lifting Tool for Wind Turbine Gearbox Maintenance
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Solution Overview
Problem
Existing methods for servicing wind turbine gearboxes are time-consuming and expensive, requiring external cranes and removal of the nacelle cover, which is impractical for older turbine designs without internal cranes.
Innovation Solution
A compact, modular lifting tool with rollers or pulleys and a lifting chain system that can be assembled inside the nacelle to lift components from the gearbox without removing the nacelle cover, utilizing existing fixing points for secure attachment and manual hoisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external full height service crane is used to lift gearbox components, then lifting capability is achieved, but service time and cost increase significantly
Solution Approach 1:
The lifting tool is divided into modular components: a frame structure with connecting portions for the gearbox housing, a separate hoisting device, and lifting chains. This segmentation allows the tool to be assembled inside the nacelle without requiring external crane installation, reducing service time while maintaining lifting capability
Solution Approach 2:
The lifting tool acts as an intermediary device between the gearbox components and the hoisting mechanism. It provides a rigid connection to the gearbox housing through connecting portions while enabling controlled lifting of heavy components using a manual or powered hoist, eliminating the need for external cranes
2Ease of operation
If the nacelle cover is removed to allow crane access, then lifting operation can be performed, but structural integrity and safety are compromised
Solution Approach 1:
The lifting tool is designed to be assembled inside the nacelle before the gearbox service operation begins. The frame structure is configured to engage with the gearbox housing internally, allowing the entire lifting system to be prepared and positioned without removing the nacelle cover, thus maintaining structural integrity while enabling the lifting operation
3Stability of the object's composition
If a rigid connection is made to the gearbox housing at the periphery of the opening, then lifting stability is improved, but the tool becomes more complex
Solution Approach 1:
The connecting portions of the frame structure are designed to utilize the existing fixing holes in the gearbox housing that are already used for securing the upper housing part. This universal approach allows the lifting tool to achieve rigid, stable connection to the housing without requiring additional holes or complex mounting structures, thereby maintaining simplicity while ensuring lifting stability
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 efficient and cost-effective internal lifting of gearbox components, reducing downtime and operational costs by allowing service personnel to perform maintenance within the nacelle without external cranes, even on older turbine designs.
Implementation Method 1
one or more rollers or pulleys or the like mounted on the frame-like structure; a lifting chain, cable, wire or rope or the like extending over the rollers or pulleys
Data Source
AI summary
A lifting tool (2) for use in lifting components (1,5) from a wind turbine gearbox during service or repair comprises a frame-like structure comprising interconnected beams (4,6,8,8,10,12,20,22,24,26,28) for securing to the gearbox housing once an upper housing part has been removed to provide an opening to the gearbox interior, the tool being secured to the gearbox at a periphery of the opening, and further comprising one or more pulleys (36) mounted on the frame-like structure, a lifting chain, cable, wire or rope extending over the pulley or pulleys attachable to a component (1) within the gearbox, the frame-like structure comprising a number of inter-connectable modules.