Wind Turbine Rotor Blade Maintenance Chamber Positioning
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Solution Overview
Problem
Existing rotor blade access systems for wind turbines face challenges in positioning maintenance chambers effectively, particularly in the horizontal plane, leading to high costs and limited flexibility due to reliance on cranes and rigid designs that do not accommodate varying rotor blade geometries and large wind turbines, making cost-effective repairs difficult.
Innovation Solution
A rotor blade access system with a maintenance chamber on an impression frame that can move horizontally and vertically, supported by a tower, featuring swivel joints and independently driven drive units to adjust along longitudinal profiles, allowing for precise positioning of the rotor blade tip within the maintenance chamber, and utilizing cable winches for vertical positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a crane vehicle is used to position the work cabin on rotor blades, then the maintenance chamber can be positioned at the required height, but the equipment complexity and repair costs significantly increase
Solution Approach 1:
The patent extracts the positioning function from the crane vehicle and implements it directly on the access system through the movable maintenance chamber design. The maintenance chamber can independently move horizontally and vertically along the boom structure, eliminating the need for external crane positioning while maintaining accurate positioning capability
Solution Approach 2:
The maintenance chamber is designed with movable connections to the boom, allowing it to dynamically adjust its position both horizontally (along the boom length) and vertically (relative to the boom). This dynamic positioning capability replaces the static crane-based positioning system, reducing equipment complexity while maintaining positioning accuracy
2Adaptability or versatility
If the maintenance chamber is fixed on the boom, then the structure is simple, but the maintenance chamber cannot be positioned horizontally along the boom to accommodate different rotor blade positions
Solution Approach 1:
The maintenance chamber is connected to the boom through movable connections that enable horizontal movement along the boom length. This dynamic configuration allows the chamber to adapt to different rotor blade positions while maintaining a relatively simple structural design based on guided motion rather than complex mechanical linkages
Solution Approach 2:
The positioning system is segmented into independent horizontal and vertical movement capabilities. The maintenance chamber can move horizontally along the boom through one set of mechanisms while vertical positioning is achieved through cable winches, allowing flexible adaptation without requiring a completely complex integrated system
3Reliability
If the rotor blade tip offset is large due to pre-curvature, then the rotor blade can avoid collision with the tower, but the rotor blade tip cannot be positioned within the opening between the longitudinal profiles of the access system
Solution Approach 1:
The maintenance chamber is designed to move horizontally along the boom, allowing it to dynamically adjust its position to accommodate the rotor blade tip's offset caused by pre-curvature. This movement capability ensures that the chamber can always be positioned correctly relative to the rotor blade tip, maintaining accessibility regardless of the blade's geometric characteristics
Solution Approach 2:
The system changes the positional parameter of the maintenance chamber along the boom to match the varying offset of the rotor blade tip. By adjusting the chamber's horizontal position, the system adapts to different blade geometries and pre-curvature conditions, ensuring the tip remains within the accessible opening
4Ease of operation
If the access system is manually deflected and pivoted in the horizontal plane to position the opening under the rotor blade tip, then the rotor blade tip can be accessed, but the adhesion of the support frame's tires to the tower and rigid connection prevent or significantly hamper this movement
Solution Approach 1:
Instead of manually deflecting and pivoting the entire access system, the maintenance chamber is designed with independent movable connections that allow it to dynamically position itself horizontally along the boom. This eliminates the need for complex manual pivoting operations while overcoming the constraints of tire adhesion and rigid connections
Solution Approach 2:
The positioning function is extracted from the main access system structure and assigned to the movable maintenance chamber. This allows the chamber to be positioned independently without requiring manual deflection or pivoting of the entire system, overcoming the movement constraints while maintaining ease of operation
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to a rotor blade access system (1) comprising a maintenance chamber (2) which is arranged on a pressure frame (5) and which can be moved horizontally and actively relative to same, and a method in which the pressure frame (5) is guided in the vertical direction on a tower (4) of a wind turbine and is supported on the tower (4) in the horizontal direction, characterised in that the pressure frame (5) has a transverse profile (8) and two longitudinal profiles (9) spaced from each other by means of the transverse profile (8), wherein each longitudinal profile (9) of the pressure frame (5) is connected to the transverse profile (8) via a pivot joint (7) such that it can rotate in the horizontal plane, and the maintenance chamber (2) is designed such that it can be moved along the longitudinal profiles (9) in the radial direction (12) of the tower on two sides, independently of one another, by means of drive units (13), and such that it can be temporarily secured to the longitudinal profiles (9) independently of one another, wherein the maintenance chamber (2) is designed to be able to carry out a movement in the horizontal plane when the maintenance chamber (2) is secured to a longitudinal profile (9) on one side and can move on the opposite longitudinal profile (9) on the other side.