OPENTECHNICAL PUBLICATION
OT-2026-000002931

Method for lifting and lowering blades without using a crane, and devices used

Published: 2026-09-15T19:16:13.113564Z
Permanent URL: https://opentechnical.org/p/OT-2026-000002931
Categories: Lifting, Positioning & Manipulation > Lift Tables and Positioners

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ABSTRACT

Disclosed is a method for lifting and lowering blades without using a crane,
which uses an aligning and inserting device to solve the problem caused by the
tilt and coning of the first/last 200-400 mm of the blade. The device
comprises at least one hoist (4) and a pair of cables (5) coordinated by a
pulley (10) and screwed to a bearing (12) by means of connecting elements at
the ends thereof. The cables (5) are screwed diametrically opposite and as
close as possible to the centre of gravity (CG) of the blade. After the
initial descent, the blade is secured and a stiffening plate (20) is added to
the blade root (13), and the lowering device, formed by a drumless hoist (18)
and a set of pulleys (19), is used to lower the blade by means of a passing
cable (22) joined to the plate (20). A crane disposed on the ground moves an
auxiliary sling placed on the tip (23) of the blade and helps to navigate the
transition piece (24) and bottom part (25) of a tower.

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OpenTechnical publication OT-2026-000002931
Published 2026-09-15T19:16:13.113564Z
https://opentechnical.org/p/OT-2026-000002931