R. Stahl claims to have plugged the gap between electric chain and wire rope hoists with its new high performance chain hoists.
Generally, in the capacity rage 2t to 5t, wire rope hoists are considered the smoother and faster option, while chain hoists are up to 40% more economical.
But Stahl claims that its new chain hoists, the ST 3200 (3,200kg swl) and the ST 5000 (5,000kg swl), are smoother and faster than other chain hoists. Greater smoothness of action has been achieved by using six teeth on the chain sprocket instead of the usual five. Stahl said that its designers have devoted particular attention to the chain drive. The galvanised, high-tensile chain has good wearing characteristics, Stahl claims, so that it can be used in automatic crane installations and in foundries where conditions are tough. The enclosed chain guide, as the only load-bearing part of the hoist, consists of wear-resistant cast metal.
Hoisting speeds are up to 4m/min for 5,000kg and up to 6.3m/min for 3,200kg. The motors have a 50% duty cycle and are suitable for inching operations. Noise level is low at a maximum 74dBA at 1m distance. All wearing parts, including brake and chain drive, can be checked from outside. Installing the clutch in the second brake step results in large friction surfaces and solid clutch parts. These provide improved temperature stability and ensure more precise reaction of the clutch.
