News | EQUIPMENT
vessel at a time in its drydock. Now the new mobile boat hoist can accommodate the synchronised repair and construction of 10 or more boats simultaneously, including US Coast Guard, US Geological Survey and other government vessels, tugs, barges, workboats and yachts. Te new hoist will allow Great Lakes Shipyard to handle emergency response repairs and make it possible for long-term projects to stay drydocked without causing scheduling conflicts. It also has double the liſting capacity of the existing drydock and further permits wider and longer vessels to be repaired.
systems both to the leſt and to the right. Tis increased capability is facilitated by an additional CNC axis in the bending head, considerably improving the flexibility of bending processes. Te use of a loosely-mounted bend former allows
the bending head to move independently of the tool. Te advantage is that even tubes with small bending radii and complex curve shapes aſter bending can be easily accommodated. Te new CNC 40 Rotary tube bending machine also benefits from shorter set-up times, lower acquisition costs and an intuitive control concept, Schwarze-Robitec claims.
www.schwarze-robitec.com
Ancillary equipment Automatic hull cleaning
The Marine Travelift 700C in operation at the Great Lakes Shipyard.
Marine Traveliſt has fitted the 700C mobile boat
hoist with its patented all-wheel electronic steering, enabling each wheel to steer independently. The increased manoeuvrability is intended to allow the Great Lakes Shipyard to develop the full potential of its facility and in particular maximise space utilisation on the landside.
www.marinetravelift.com
Welding Going round the bend
Te newly-developed CNC 40 Rotary from German manufacturer Schwarze-Robitec is a CNC-controlled, cold bending machine, designed for bending tube
An image of the CNC 40 machine.
system unveiled What is claimed to be the world’s first automatic hull cleaning system for small to medium sized boats has been developed by the Italian company, Imera Progetti, using servo-drives from Control Techniques, a division of the Emerson group. Te system, the Corydoras Hull Washer, was designed and produced for Morace Port Facility and Services Srl, of Padova near Venice, and provides a ‘drive-through’ in-water hull cleaning service to remove algae, seaweed and crustaceans without the time and expense of a dry dock. The Corydoras Hull Washer comprises a
partially submerged load-bearing structure and a boat handling system. It is provided with a range of cleaning brushes and rollers suitable not just for cleaning the hull, but other structures such as stabilisers, rudders and propellers. Underwater cameras monitor progress and provide visual evidence that the hull has been thoroughly cleaned while numerous safety systems ensure that there is no damage to the vessel. Te process comprises an initial cleaning stage,
using jets of air and high pressure water (up to 500bar) providing an initial clean, particularly for inaccessible areas. Tis is followed by specialised cleaning rollers which use sonar feedback to the drives for automatic positioning. For particularly bad fouling the entire process can be repeated. The handling of each vessel is controlled by
servo-motors and Digitax ST Plus servo-drives supplied from the Control Techniques Drive Centre in Vicenza. Tese drives provide onboard control of multiple axes of movements of the washer, from the movement of the vessel through the washer at 1m/min, to the more precise movements of the brushes and rollers. Te system automatically adapts the handling system to fit each boat and analyses the height, width and lateral profile of the vessel
18 Shiprepair and Conversion Technology 1st Quarter 2012
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