IMPROVEMENTS IN OR RELATING TO MINE HOISTS

摘要

A mine winder has two cable drums and a braking mechanism for each. Each braking mechanism includes means operable to sense if the cable is moving and in which direction and the length of cable paid out and to issue a control signal containing this information. Brake control means is operable on receipt of the control signal to operate braking means and apply to the drum a braking effort based on the information in the control signal. A cable movement detector sensitive to the speed of movement of the cable may be provided to be operative to send a corresponding control signal to the brake control means. The braking means may be air-pressure operated, the brake control means adjusting the air pressure according to the control signal received.