LASSTEC is the first technology to measure the load “where it really happens” which is directly on the twistlock of the spreader. The system can be installed into any existing or new spreader and for any application. A small hole is drilled into the centre line of the twistlock where a specially designed load sensor is inserted. The sensor measures the elongation of the twistlock when under load. The signal can be used for load measurements, but it also provides vital information used for additional operational safety in container handling.
Each twistlock sensor is connected with a wire to a central processing unit which is mounted on top of the spreader. The processing unit then sends the information to the crane via the spreader cable. The communication can either be through a bus system such as CAN open or analog signals such as 4-20mA. The crane PLC uses the data to control the hoist system in case an unsafe handling situation occurs. A monitor in the crane cabin can display the loading situation of the spreader. The load information is stored by the processing unit and can be stored by the crane PLC.
The twistlock is the first component to “feel” the load and therefore the most logical one to use to detect a problem. Consequently, the system has the following main advantages: