Long-lasting performance in the slewing mechanism

More movement in cargo handling: Special spherical rotary joints from Rodriguez ensure precise, backlash-free rotation in Peiner's mobile crane slewing mechanisms. Even under heavy-duty conditions, they transmit forces safely and without backlash, reduce maintenance costs, and impress with their long dynamic service life.

Peiner SMAG Lifting Technologies, based in Salzgitter, Germany, is one of the world's leading manufacturers of grabs for loading and unloading bulk carriers – from mechanical four-rope grabs to radio-controlled models. In addition to around 5,000 grab variants, Peiner also offers slewing mechanisms for precise turning and positioning of loads, which are used in port cranes, among other things.

Particularly load-bearing and stable

High load capacities of more than 300 tons, extremely limited installation space, and extreme environments – the rotary joint in the slewing mechanism must perform under demanding conditions. This is where Rodriguez's robust four-point bearings prove their worth, as Product Manager Martin Stremmel explains: “Our double-row four-point bearings are extremely reliable in dynamic slewing operation. They can withstand frequent starting and braking as well as changing loads. Compared to cross roller bearings, they are less sensitive overall, more shock-tolerant, and quite uncomplicated to install.”

Designed for heavy-duty work

For use at Peiner, the experts at Rodriguez adapted a double-row, external-tooth ball rotary union to the customer's specific requirements, in particular the raceways, screws, and toothing. Despite its compact dimensions, this rotary union can cope with very high load requirements.

The right ball slewing ring in the right place

Ball slewing rings from Rodriguez are not only characterized by their high performance, but also by a wide range of sizes with inner diameters from 30 mm to an outer diameter of over 6,000 mm. Extremely small or particularly large ball and roller slewing rings are produced specifically to customer requirements. “Our core competence is solutions that go beyond the standard. We develop individual drive components and also manufacture them ourselves. The proportion of in-house production is now over 50 percent and is set to be expanded further,” says Product Manager Stremmel, looking to the future.