Self-hoisting crane system and method of hoisting a self-hoisting crane
AssigneeLiftra IP Aps
InventorPer Eske Fenger
Life of this patent
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Abstract
The self-hoisting crane is adapted to be hoisted from a container to a nacelle by operating a cable winch in the container, at least one cable is adapted to extend from the cable winch, around an exit sheave arranged in the container, and exit the container from the exit sheave in an upward direction in order to pass around at least one roller arranged at a crane base on the nacelle and continue in a downward direction to the crane, enter through a central opening in the crane pedestal and continue to the hook block. The exit sheave is located at a longitudinal position of the container deviating not more than 10 percent of the length of the container from the longitudinal position of the centre of gravity of the container.
Claims20
A self-hoisting crane system including a self-hoisting crane and a container for transporting, lifting and lowering the self-hoisting crane to and from a wind turbine, wherein the container has a longitudinal direction extending from a first to a second end of the container, wherein the container includes a cable winch arranged in the first end of the container, wherein the self-hoisting crane is adapted to be hoisted from the container to a nacelle of the wind turbine by operating the cable winch in the container, wherein at least one cable is adapted to extend from the cable winch in the container, around an exit sheave arranged in the container, and exit the container from the exit sheave in an upward direction in order to pass around at least one roller arranged at a crane base arranged on the nacelle and continue in a downward direction to the self-hoisting crane, enter through a central opening in a pedestal of the self-hoisting crane and continue to a hook block of the self-hoisting crane, wherein the container includes a guide system adapted to guide the self-hoisting crane during part of the lifting and lowering of the self-hoisting crane from and to the container, and wherein the container including the cable winch, the guide system, the exit sheave and any auxiliary hoisting equipment located in the container, has a centre of gravity located at a longitudinal position between the first and second ends on the container, wherein the exit sheave is located at a longitudinal position of the container deviating not more than 10 percent of the length of the container from the longitudinal position of the centre of gravity of the container.
A method of hoisting a self-hoisting crane of a self-hoisting crane system, whereby the self-hoisting crane is transported to and from a wind turbine in a container, whereby the container has a longitudinal direction extending from a first to a second end of the container, whereby the self-hoisting crane is lifted and lowered between the container and a nacelle of the wind turbine by operating a cable winch arranged at the first end of the container, whereby at least one cable extends from the cable winch in the container, around an exit sheave arranged in the container, exits the container from the exit sheave in an upward direction and subsequently passes around at least one roller arranged at a crane base arranged on the nacelle and continues in a downward direction to the self-hoisting crane, enters through a central opening in a pedestal of the self-hoisting crane and continues to a hook block of the self-hoisting crane, and whereby a guide system of the container guides the self-hoisting crane during part of the lifting and lowering of the self-hoisting crane from and to the container, wherein the at least one cable exits the container from the exit sheave so that, during lifting and lowering of the self-hoisting crane from and to the container, a tip end of a boom arm of the self-hoisting crane leaves and enters the container at an intermediate position between the first and the second end of the container.
Dependencies are inferred from the claim text.