Modular Tower Lifting Assembly for Wind Turbine Maintenance
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Solution Overview
Problem
Current lifting solutions for wind turbine maintenance, such as large cranes, are unstable in high winds, require extensive assembly and transportation, and are costly due to their size and weight, leading to inefficiencies and increased maintenance time.
Innovation Solution
A lifting assembly comprising adjustable tower segments and a platform-mounted crane that allows for balanced weight distribution, reducing wind sensitivity and enabling efficient component transport and assembly by minimizing the need for long wires and reducing the overall size and weight of the lifting equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large cranes are used to lift components, then lifting capacity is sufficient, but the cranes become unstable in high winds and require extensive assembly and transportation
Solution Approach 1:
The lifting assembly is divided into multiple tower segments that can be assembled in sections, allowing the structure to be transported in manageable parts and assembled at the wind turbine site. This segmentation reduces the complexity of transportation and assembly while maintaining the overall lifting capacity and stability.
Solution Approach 2:
The invention transitions from using a single large crane to a multi-level tower structure with platform at different heights. This dimensional change allows the lifting operation to be performed from an elevated position, reducing the influence of wind on the lifting mechanism and improving stability.
2Reliability
If large cranes are used to lift components, then lifting capacity is sufficient, but the cranes are sensitive to wind and cannot operate when wind velocity exceeds certain limits
Solution Approach 1:
The tower structure provides a stable, heavy base that counteracts the effects of wind on the lifting operation. The mass of the tower segments and platform creates a low center of gravity, reducing the sensitivity to wind forces and allowing operation in higher wind speeds than conventional cranes.
Solution Approach 2:
By performing the lifting operation from an elevated platform rather than from ground level, the invention reduces the lever arm of wind forces acting on the lifting mechanism. The height of the platform diminishes the impact of wind on the crane's ability to lift components reliably.
3Reliability
If large cranes are used to lift components, then lifting capacity is sufficient, but the cranes require a large amount of vehicles for transportation and take a very long time to assemble
Solution Approach 1:
The crane is segmented into multiple tower segments that can be transported by standard vehicles and assembled at the site. This segmentation dramatically reduces the number of specialized vehicles needed and accelerates the assembly process compared to transporting and assembling a single large crane.
Solution Approach 2:
The tower segments can be pre-manufactured and pre-assembled into modular units that are easily transported and quickly assembled at the wind turbine site. This preliminary preparation of modular components reduces on-site assembly time and logistical complexity.
4Reliability
If conventional cranes are used, then lifting function is achieved, but the assembly and maintenance become expensive and time consuming
Solution Approach 1:
The modular tower segments allow for quick assembly and disassembly, enabling faster setup and teardown during maintenance operations. This segmentation improves productivity by reducing the time required to deploy and remove the lifting assembly compared to conventional cranes.
Solution Approach 2:
The lifting assembly is designed to be dynamically adjustable, with the tower segments and platform capable of being assembled and disassembled as needed. This dynamic configuration allows the system to be quickly deployed for maintenance and then rapidly removed, improving overall maintenance efficiency and reducing downtime.
Data Source
AI summary
A lifting assembly for elevating components to a wind turbine. The lifting assembly comprises a plurality of tower segments adapted to be arranged on top of each other to form an elongated tower, and a lifting device including a support frame for supporting the tower, a securing assembly for securing the tower to the wind turbine, and a crane having a base part and a jib rotatably connected to the base part. The lifting device comprises a platform arranged vertically moveable between a lower and an upper position. The platform has a first storage area for supporting components with a weight of more than 10 tons. The crane is mounted on the platform and is configured to move the components between the platform and the wind turbine when the platform is in the upper position. The platform is provided with an opening adapted to receive the tower segments. The crane and the first storage area are arranged on opposite sides of the opening, and one of the tower segments is a top segment having an upper part provided with a second storage area for supporting components with a weight of more than 10 tons. The invention also relates to a method for using the lifting assembly for replacing an old component of a wind turbine with a new component.