Ship to Shore (STS) cranes
Ship to Shore crane systems are located in ports around the world in order to transport containers from ship on land or, vice versa, from land onto the ship. These crane systems are expected to handle clearly defined quantities within a prescribed time.
Nowadays so-called twins/double spreaders are used in order to be able to unload large container ships in an economical way. This equipment makes it possible to move two containers at the same time. A further increase can be achieved by using the double hoisting drive motor. This makes it possible to move two 40-foot containers or four 20 foot containers. A loading rate of 25, 50 or even up to 80 containers per hour is theoretically possible.
Many of these crane systems have a weight of over 2000 tonnes and often have 24 traction drives with a capacity of approx. 25 kilowatts per motor. Containers are lifted at a rate of up to 100 metres per minute. Speeds of up to 180 metres per minute are realised during the lowering process, with an acceleration / deceleration rate of 0.8 to 1.2 m/s² being necessary. For this purpose either 2 or 4 drive motors with a capacity of up to 1000 kilowatts per motor are required. The trolleys, which are frequently operated with ropes, achieve speeds of up to 240 metres per minute. A capacity of approx. 400 kilowatts is made available for this purpose. The boomhoist, depending on projection and/or boom length, has a capacity of up to 500 kilowatts and retracts the boom within 3-5 minutes.
We supply our drive motors principally to crane outfitters like ABB, Converteam, General Electric and Siemens. Our drive motors for STS cranes are meanwhile firmly established features at the European ports of Rotterdam, Antwerp, Hamburg and Bremerhaven as well as a considerable number of other important ports throughout the world. The largest STS container cranes in Hamburg went into operation two years ago with our drive motors. In Summer 2008 6 new and even larger cranes, for which we have supplied all the drive motors, are to be set up at Hamburger Hafen Logistik AG (HHLA). These cranes differ from others in that they have been designed with double hoisting equipment. There are 4 hoisting equipment motors each with a drive capacity of 1000 kilowatts.