1 year ago

MDA Technologies 4/2014

MDA Technologies 4/2014


Drive Technologies Wuhan in ever growing quantities, establishing addi-tional unloading and loading bases along the coast – preferably under WISCO’s own direction – had become a pressing issue some time ago. Partnering up with two co-financiers, WISCO eventually came to hold a stake in a new port construction project in the island town of Wugang, in the south of the Zhoushan Archipelago. All facilities at Wugang Port were built in 2010 and 2011. The German manufacturer of full-scale drive solutions, Nord Drivesystems, supplied more than 170 heavy duty geared motors. As inspections, test runs and approvals for full-scale operation have concluded in mid-2012, Wugang now serves as WISCO’s main transshipment terminal with a cargo throughput of up to 30 million tons of ore per year. The port includes an unloading berth boasting a water depth of 27 m, where huge ships carrying up to 300,000 dwt can arrive. Three loading berths are 15 m deep and can accommodate smaller ships – one will fit a 50,000 dwt class vessel, two are cut out for 10,000 dwt ships. Designed to handle up to 5,000 tons of ore per hour, the ship loaders, ship unloaders, and bucket-wheel stackers installed along the berths and yards in Wugang Port are all the biggest equipment of their kind for civil use in China. 01 Reliable drive solutions are essential Given Wugang Port’s location and limited accessibility from the mainland and even the larger islands of the Archipelago, WIS- CO’s key requirement for all heavy machinery was extremely high reliability and low maintenance characteristics. It takes at least one hour for a mainte-nance crew coming from the coast or Zhoushan Zhujiajian Airport to get to Wugang by ship, plus possible delays in bad weather, which might also rule out helicopters as an alternative. In any case, serious problems with machinery would very likely incur staggering costs for repairs and, of course, disturbances of unloading and loading processes due to dysfunctional equipment. Therefore, highly reliable drive solutions are required to ensure that large gantry cranes, conveyors and the like keep moving. Nord Drivesystems was commissioned to supply heavy duty geared motors. Headquartered near Germany’s foremost harbor city of Hamburg, this company was anything but a stranger to the maritime world: Nord has a long track record of supplying mechanical and electronic drive technology for gantry cranes and other port ma-chinery – albeit in other parts of the world. Though Nord now has a considerable presence in China that includes several production and assembly plants and a number of regional offices, the German company only set foot in the country a couple of years ago. Still, the superior quality and durability of the drive products as well as the pre- and after-sales services prof-fered by the drive specialist prompted WISCO to have the bulk handling machinery at Wugang Port equipped with geared motors supplied by the Chinese branches of the German company. A very experienced manufacturer of top-quality large gearboxes, the company en-sures long service life, minimum maintenance requirements, and high load tolerance for the complete geared motor. Over 170 units were integrated into cranes and conveyor systems sourced from several different Chinese OEMs. All partners cooperated very well, and Nord’s team was readily available for OEM support through- 01 Large stacker-reclaimers service the iron ore stockyards at the port 02 WISCO had heavy-duty, but low-maintenance Nord geared otors installed as traveling drives for port machinery 03 Nord drives move the loaders on tracks along the berth 22 MDA Technologies 4/2014

out the project. From the day Wugang port was opened, all machines have been used to capacity almost all the time, with the drives reliably doing their duty. Geared motors for demanding conditions Three very large clamshell unloaders (2,500 t/h) serve the 300,000 dwt berth. These machines incorporate a total of 72 three-stage bevel gear units from Nord. Two massive mobile ship loaders (5,000 t/h) are equipped with 16 threestage bevel geared motors and a two-stage heli-cal bevel gear unit each. These drives are capable of moving these large systems along the berth on tracks to position them as needed to access various areas of operation. Another 72 three-stage bevel gear units are installed in three bucket-wheel stacker-reclaimers (500 t/h) for the ore stockyards at the port. All geared motors at Wugang feature a heavy duty housing that makes them suitable for outdoor use and severe weather. Well sealed against moisture ingress and fitted with corrosion- and moisture-resistant components, they provide a high degree of protection against the typical challenges of maritime environments. Special paint coats are applied against the salty atmosphere. These units are also tough enough to resist considerable mechanical shock. Most units come equipped with application-specific optional parts, includ-ing e.g. dust- and corrosion-protected brakes, micro-switches for continuous brake monitoring, or double canopies serving as drip covers at the motor fans. Such features make these geared motors even more reliable. Designed to move large loads without fail For drives used in port installations, a robust, wear-resistant design also means that geared motors must be constructed to withstand massive forces, since the machines they move are faced with very large loads most of the time. All gear units are manufactured from a single housing block – an original Nord development. This design ensures optimal resistance to axial and radial forces as well as high efficiency, high output torques, low-noise operation and min-imal maintenance efforts during a long service life. Nord can specify and deliver a versatile range of helical bevel geared motors for port machinery, all from About Company name: Nord Drivessytems Headquarters: Bargteheide, Germany Turnover: approx. €450 m (Nord-Group) Employees: more than 3000 worldwide Products: Geared motors, industrial gear units, motors, frequency inverters, motor starters in-house production. Solu-tions for cranes and trolleys feature a wide choice of gear ratios. The manufacturer supplies two or three-stage designs with a hollow or solid shaft as required. Users can choose between models with a foot mount, flange models, and shaft-mounted models. All types are equipped with the same spacesaving housing, which allows for easy integration. Though motors used in cranes and trolleys often operate around the clock, some loading facilities may also stand still for certain periods of time. The build standard of the drives ensures that normal operation can be resumed directly after even prolonged phases of this kind, without any special maintenance requirements. Moreover, all models are also available as explosion-protected (ATEX) versions if required. 02 03 MDA Technologies 4/2014 23


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