Trolley and hook block sensors arrest tower crane load sway

The Wolff 6523 Clear, debuting in Europe with a North American version in the works, features a newly designed jib plus technical equipment for operating the manufacturer’s High-Speed-Positioning-System (HiSPS), introduced last year at the bauma trade fair in Munich. Sensors on the trolley and hook block, coupled with a control unit, enable the load to be transported free of sway by detecting the rope’s movements and automatically adjusting the movement and crane speed. 

Since the trolley always adjusts its position automatically via the hook block, not only is the wind impact eliminated, but it also prevents a diagonal pull on the load—making pushing the load by hand and pulling the hook manually easier and safer. The Wolff 6523 Clear is the first model with the technological prerequisites to activate HiSPS, an option at time of crane order. Along with the HiSPS, the 6523’s new jib features new bottom chord connection. Instead of using bolts, the jib sections, including the rope swivel traverse, are mounted on the front with a mandrel and wedge connection. In turn, in the top chord, the pins are inserted into pear-shaped holes, resulting in easier assembly without a hammer.

“This new development also provides advantages during crane operation,” says Wolffkran Head of Product Management and Business Development Dr. Mohamed Abouelezz. “Thanks to the smooth jib transitions, trolleys equipped with lateral guide rollers run more steadily and smoothly along the jib. This makes it easier to finely position the load, even without using the High-Speed-Positioning-System.”

The Wolff 6523 Clear is equipped with a 45-kw hoist winch. It lifts a maximum of 8.5 tons in 2-fall operation with a jib length of 30 meters and 12.5 tons in 4-fall operation with a reach of 21.5 meters. At a maximum jib length of 65 meters, the crane has a tip load capacity of 2.3 tons in normal operation and 2.5 tons with the activated Boost function. The jib can be extended from 30 to 65 meters in 2.5-meter increments. — Wolffkran International AG, Baar, Switzerland,