Portable Modular Hoisting Assembly for Wind Turbine Maintenance
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Solution Overview
Problem
Current methods for maintaining and repairing wind turbines, such as using external cranes or permanently mounted service cranes, are costly and inefficient due to the increasing size and weight of turbine components, and pose safety risks due to relative movement between the crane and turbine structures.
Innovation Solution
A portable and modular hoisting assembly (PMHA) that includes a frame assembly and lifting devices, which can be easily assembled and disassembled on the nacelle, allowing for heavy component lifting and transport using standard containers, reducing the need for heavy external cranes and enhancing safety by utilizing the wind turbine tower's structural capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If external ground level cranes are used to hoist heavy wind turbine components, then the lifting capacity is sufficient, but the costs increase significantly with the size and weight of components
Solution Approach 1:
The hoisting assembly is divided into modular components including a frame assembly with vertically spaced legs, horizontal crossbeams, and detachable lifting devices. This segmentation allows the system to be transported in standard containers and assembled on-site, eliminating the need for expensive heavy external cranes while maintaining sufficient lifting capacity for wind turbine components
Solution Approach 2:
The portable hoisting assembly acts as an intermediary between the ground and heavy wind turbine components. It provides a intermediate lifting platform that can be positioned at the turbine site and used to hoist components without requiring direct intervention from heavy external cranes, thereby reducing costs
2Force
If service cranes are permanently mounted on the hub or nacelle, then the lifting capacity is sufficient, but the weight of the nacelle and load on the tower increase
Solution Approach 1:
The lifting devices are designed to be movable and detachable rather than permanently fixed. They can be attached to the frame assembly when lifting operations are needed and removed when not needed, making the system dynamic rather than static. This allows the nacelle to carry the lifting capacity only when required, reducing the permanent weight burden on the tower
Solution Approach 2:
The frame assembly and lifting devices are prepared and assembled on the ground before being transported to and installed on the nacelle. This preliminary preparation allows the system to be ready for use without adding permanent weight to the nacelle, as components can be installed only when maintenance or component replacement is needed
3Adaptability or versatility
If nacelle and hub are arranged with crane foundations and attachment points, then service cranes can be mounted, but additional support and strengthening increase the weight of the nacelle and load on the tower
Solution Approach 1:
The attachment system is segmented into detachable connection points that can be selectively engaged with the nacelle structure. Rather than requiring comprehensive strengthening of the entire nacelle, only specific attachment points need to be reinforced, minimizing the added weight while providing adequate mounting capability for the portable lifting devices
Solution Approach 2:
Instead of uniformly strengthening the entire nacelle structure, the patent applies reinforcement only at the specific locations where lifting devices will be attached. This localized strengthening provides the necessary mounting capability while minimizing the overall weight increase of the nacelle and the load on the tower
4Force
If heavy external cranes are used for lifting operations, then the lifting capacity is sufficient, but the mobilization costs and standby costs increase
Solution Approach 1:
The hoisting assembly is segmented into modular components that can be transported in standard containers and quickly assembled on-site. This eliminates the need for mobilizing heavy external cranes, which require special transportation arrangements and extensive assembly time. The modular system can be rapidly deployed and dismantled, reducing both mobilization time and associated costs
Solution Approach 2:
The portable hoisting assembly is designed as a temporary, reusable system rather than a permanent installation. It can be quickly assembled, used for the required lifting operations, and then dismantled and transported to the next site. This temporary nature eliminates the need for expensive heavy cranes that must be mobilized and kept on standby, reducing both time and cost losses
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
Portable and modular hoisting assembly (200) for a wind turbine (100) for hoisting heavy components of the wind turbine (100), the hoisting assembly including a frame assembly (300) for detachable arrangement to a base structure (106) of a nacelle (103) and a lifting assembly (400) arranged to the frame structure (300).