The hoist controllers for modern electric winding engines have long included such features as automatic starting of the hoist when the weight of coal or ore in the skip reaches a set point, automatic acceleration of the hoist to full speed and automatic deceleration at the end of travel.. Hoist controllers need both velocity and absolute position references taken, typically taken from the winding drum of the hoist.. Modern hoist controllers replace many of the mechanical analog mechanisms of earlier controllers with digital control systems.
For historical reasons, the operator of a hoist controller is frequently known as a winding engine driver
In the mining sector in South Africa, the action of raising and lowering persons or material is facilitated, by means of an onsetter(person)underground (on a certain landing level) and a Banksman(person), working on the shaft-bank area. These persons communicate with the Winding Engine Driver(WED) by signalling on a locked bell system. These signals are interpreted by the WED as to what action is needed by the Onsetter and Banksman with regard to the movement of the conveyance(s). For example: The banksman will signal 1(one) to the WED and then the WED will control the machine in such a way that the conveyance will be raised at the shaft bank. The tone of the signal will differ from that of the onsetter, so that the driver will know from whom the signal is coming. There are many different signals rung in sequence. Each signal will have a different meaning to the WED. There are signals for raising, lowering, raising slowly, lowering slowly. A signal which informs the WED that the conveyance is clear and that the WED may proceed to perform whatever action He/She wants to perform at His/Her discretion. There are also signals informing the WED of what contents the conveyance is transporting, persons, material, explosives, long material attached to the bottom of the conveyance etc. These signals are standardised on all mines in South Africa, and have been approved by the government mining engineer (a person appointed by the minister of minerals and energy affairs). These signals are known as the Government Code of Signals. Special signals for a specific mine have to be approved by the regional director (an inspector of machinery appointed by the minister of minerals and energy affairs) and can only be used once approved. No other signals than these signals are allowed.
US LABOR DEPARTMENT'S OSHA FINES REPUBLIC ENGINEERED PRODUCTS $143,000 FOR EXPOSING WORKERS TO FALL HAZARDS, LACK OF PROTECTIVE GEAR.
Nov 08, 2010; LORAIN, Ohio -- The following information was released by the Occupational Safety and Health Administration: The U.S. Department...