Automation of control of scraper conveyors

Abstract

Delivery of coal from the mine face in most cases is carried out by several scraper conveyors forming a conveyor line. The start-up of such a line should be carried out by alternately switching on the conveyors in the sequence reverse to the coal flow. To reduce the voltage drop in the network, the sequential start of motors should be made with a certain time delay. Conveyors should be stopped in the sequence corresponding to the direction of coal flow. In recent years, coal mines have done a lot of work on the transfer of area conveyor lines to remote control. However, remote control of scraper conveyors with the help of magnetic starters, even in the case of their electrical interlocking, does not eliminate the operations of sequential time delayed start of motors and monitoring the work of conveyors. Therefore, remote control does not cause reduction of labor intensity of works on maintenance of conveyor installations. For complete elimination of these works it is necessary to supplement the system of remote control with automatic devices providing consecutive with time delay start of motors and control over the state of electrical and mechanical parts of each conveyor, i.e. it is necessary to realize automated remote control of conveyor line.