The Pro-Bel Wind
Turbine Blade Access System is an innovative, engineered, suspended
maintenance solution to blade cleaning that is typically offered under a
maintenance service contract.
Typically, a Pro-Bel
crew arrives at the turbine site with specialized rigging equipment
consisting of a square-shaped modular aluminum platform with a “hole” in
the center (square donut). The platform, configured to suit the size of
the blade, is suspended using twin traction hoists and a four cable
system secured to a single anchor point (upper suspension points) at the
top of the turbine tower on the underside of the nacelle or generator
housing. The cables from the hoists (two primary and two secondary) are
also connected on the ground to “pulling frame” structures mounted on a
flatbed truck or trailer that reels the cables in and out to access the
counterbalance weight mounted to outriggers keeps the platform
horizontal during use. The complete system is controlled from either the
platform mounted central control box or the ground and includes
anti-tilt safety devices, emergency stop buttons, overload protection,
top limit switches and safety brakes connected to the two secondary
steel wire ropes.
personnel employ industry standard fall protection harnesses, lifelines
Another area of
concern over time is the maintenance of the tube itself; this requires
another smaller platform that is set up in the same manner as the blade
access platform. With this unit two smaller baskets are on the end in
order to have some access to the blade if required.
A pull back unit is
located on the trailer in order to pull the unit towards the blade.