STAHL CraneSystems GmbH

"Strictly speaking, we were not in a position to accept the order," says Martin Klossek, project manager in the International Projects department. The end customer in India demanded a load test of hoist and crab under all load conditions for all seven 30 t wire rope hoists. "There is no way we can do this on our test rig in the plant," Martin Klossek explains. However a solution was found by teaming up with Gerhard Deitigsmann, a member of the customer service department. A rarely used double girder overhead travelling crane with a lifting capacity of 40 tonnes was installed in a building in a quarry 10 km from the STAHL CraneSystems plant. A suspension and a spreader beam were designed specially for the test for attaching the hoists to the crane and suspending the test weights.
"The particular characteristic of these hoists is their compact construction and great lifting height, no-one but us was able to offer this," Martin Klossek explains the design: "The wire rope hoists are to work in a narrow corridor between two hoppers for debris. We therefore had to shorten them to a width of 1.27 metres. We managed this by using off-standard travel drives." The result: seven identical wire rope hoists – in explosion-protected design due to the prevalence of coal dust in the plant. Stationary hoist and crab are combined in a single unit. The 8-wheel off-standard crabs are equipped with angle drives. The hoists are operated with a fixed position control.
The hoists from Künzelsau are to start work in the new coal gasification plant in about a year's time according to the schedule. They are needed for maintenance work on coal crushing mills which they lift out of grinding stones and set down at the base of the system, 27 metres down.
The off-standard suspension and spreader beam will be stored in the STAHL CraneSystems plant. "From now on, we can test hoists up to 40 tonnes S.W.L. under real conditions," says Gerhard Deitigsmann proudly. "There are very few manufacturers in Germany who can do that."

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