Cable drum, for crane lifting mechanism with sensing for limiting cable unwinding, has non-electrical signal source at drum position corresponding to maximum permissible unwinding feeding static sensor

摘要

The device has a sensor arrangement for detecting maximum permissible lifting cable unwinding from the drum with a signal connection to the crane controller. A signal source at the drum position corresponding to maximum permissible unwinding outputs a non-electrical signal when the cable is lifted from this position. The signal passes to via a signal conductor in the drum to a stationary external sensor that converts it into processable form. The device has a sensor arrangement for determining a maximum permissible unwinding of the lifting cable (3) from the casing (5) of the drum (2), which is mounted on bearings on both ends, with a signal connection to the crane controller. A signal source (6) at the position on the drum corresponding to maximum permissible unwinding outputs a non-electrical signal when the cable is lifted from this position. The signal passes to the rotary bearing via a signal conductor (7) in the drum to a stationary external sensor (8) that converts it into a form that the controller can process.