APPARATUS FOR TESTING ARAMID FIBER ELEVATOR CABLES

摘要

The invention concerns an apparatus for inspecting and calculating the residual strength of an aramid fiber cable 7 driving an elevator 3 to determine when such cable 7 is in need of replacement. The apparatus includes a transmitter 22 for introducing an acoustic wave that will travel along the aramid fiber cable 7 and a receiver 24 for receiving the acoustic wave after its has traversed a designated section of the cable 7. The transmitter 22 and receiver 24 provide signals indicating the times the wave was sent by the transmitter 22 and thereafter received by the receiver 24. From these signals, a program in the system calculates the wave velocity and the modulus, and the residual strength of the aramid cable 7.