Another week, another problem solved by our design team. The last couple of months have seen two Pelloby double girder 12.5 tonne overhead electric travelling crane systems undergoing factory acceptance testing prior to installation.
The double girder cranes have been designed to fit within the limited space in the customer’s building; the stepped low head room box girders and the low construction crab unit ensures that the height to the underside of the girders and the height to the hook in its top position is maximised.
With a built-in radio-controlled operation and featuring a special communication system between the two cranes, these impressive lifting systems can be operated individually or work together in tandem to suit the specific requirements of the tasks in hand.
When using cranes in tandem it is essential that the system has a failsafe feature to stop either crane being used in the event of a problem with either crane. Pelloby have developed a state-of-the-art solution to ensure that when both cranes are operated by a single person, all safety related functions are monitored and communicated back to a master controller. The system monitors and synchronises all operating speeds together with the acceleration and deceleration ramps to provide a safe synchronised lift. In the event any sort of issue between the cranes, both cranes will stop immediately.
The cranes are fitted with laser measuring devices which in normal operation act as end of travel and anti-collision limit switches. When put in tandem mode the distance between the cranes is stored in the control system and this is constantly monitored in order to ensure that the distances are always maintained when in use. If the distance increases or decreases beyond a working tolerance, then the cranes will stop. Overload limits are also monitored on both cranes.
Power and control cables are taken to the hoist crab unit via a compact energy chain system packaged neatly between the crane girders, making the overall appearance of the crane aesthetically pleasing and removing the possibility of festoon cables hanging below the girder and creating a snag hazard.
Both cranes will be delivered, installed and tested by our fully trained installation team.
For more information, please call us on 01952 586 626 or email sales@pelloby.com.