System for assembling/disassembling windmills

A system for assembling/disassembling windmills including constructive components that include a tower, a nacelle and a rotor, comprising:

• a main structure, having one hoisting point or two hoisting points at different heights, being configured to be coupled at different working positions to a tower of a windmill, which is one of under construction or constructed, as a holding pillar
• four electrically operated cranes for hoisting or lowering the main structure in an ascent or descent operation along the tower, wherein, in hoisting or lowering the main structure, a geometry of the main structure is varied to avoid collision with the constructive components;
• wherein the main structure is further configured as a load holding element movably attachable to a tower segment at a beginning of tower construction, at an end of the tower construction and during the ascent or descent operation between the beginning and end of the tower construction,
• arms being coupled to the main structure to generate pressure to transmit stresses to the tower, wherein the arms have a structure that is adjustable via a hydraulic system of hydraulic actuators and hydraulic cylinders to generate working pressures against the tower to accommodate different diameters of the tower during the ascent or descent operation along the tower, wherein springs are arranged to maintain the working pressure in an event of a failure of the hydraulic system;
• an intermediate fixing structure, which is configured for fixable attachment to another tower segment, comprises a plurality of pressure arms positionable at a handling point located below a top of the another tower segment and above a center of gravity of the another tower segment;
• two pivoting arms coupled to the main structure having a pulley system and two hooks;
• an auxiliary beam, having an anchor hook for connecting to the constructive component of the windmill, connectable to the two hooks of the two pivoting arms, wherein translational and rotational movement is imparted to the anchor hook to adjust and position the connected constructive component,
• wherein, while on the ground, correct positions for tower segments are indicated before being attached to the intermediate fixing structure so the tower segments are placed, without rotation, on the tower under construction.