Wolffkran introduces latest in clear series

The WOLFF 6015clear topless saddle jib crane, by Wolffkran, rounds off the company's line of flat top tower cranes. The prototype of the model was assembled on the factory premises in Heilbronn at the end of February.

The WOLFF 6015clear offers three different tower connections and two different hoisting winches. The smaller hoisting winch, Hw 628 FU, has an installed motor power of 28 kW. The more powerful hoisting winch, Hw 845 FU, with 45 kW, can also be used. Both hoisting winches offer a hook path of 190 meters. Considerable part-load working speeds are achieved through the use of frequency-controlled winches. With the higher-power hoisting winch, Hw 845, speeds of 115 meters/minute are possible, even with a load of 1.6 ton meters, which corresponds to the weight of a medium-sized passenger car.

The new crane was available to the market in April 2008. Three models are currently available: the WOLFF 6015clear with 140 meter load moment; the WOLFF 6023clear with 180 meter load moment; and the WOLFF 6031clear with 224 meter load moment. With a lifting capacity of 1.5 ton up to 60 meter radius, and 8.5 ton up to 14.8 meters, the latest model is ideal for small and medium-sized building sites, according to the company. The smallest of the clear line can also installed to supplement the larger models – in both the other clear cranes and also in larger cranes with tower top (the cross line).

The driver's cabin and the electric cabinet are placed on a steel platform that can be bolted on. Because of its design, the crane is supplied with power immediately after installation of this unit, eliminating the need for manual rotation of the upper part of the crane to assemble the jib and counter jib. The counter jib is manufactured in one piece, and the dimensions are optimized for container transport. At the rear end, a permanent 1.8 ton counter ballast block is placed in the girder of the counter jib. The hoisting platform is installed directly above it. The hoist winch can be changed quickly.

Ten uniform counterweight units weighing 2.05 tons are positioned directly in front of the hoist winch. For simpler assembly of the counter jib's tie bars, small support brackets are provided as standard. Large-scale platforms were created on top of the counter jib for safe access to hoist winch and counterweights.

The two-rope fall trolleys have been standardized and can be used with all three cranes of this series. As with the other models, the trolley is provided with a service cage. Using this, the assembler can travel to the end of the jib while reeling in the hoisting rope and doesn't have to walk along the jib. All the company's cranes offer a teleservice module with autocall function. With this feature the crane automatically “phones” the Wolffkran control center if an error persists over a certain period of time.