Method for controlling roller in longwall face, involves providing electro-hydraulic support frames with electro-hydraulic control unit, where control commands are inputted to control device of expansion rack

摘要

The method involves providing electro-hydraulic support frames with an electro-hydraulic control unit, where control commands are inputted to the control device of an expansion rack for correcting the position of the roller arm. The information is transmitted to the roller control on the location of the controller. The roll control system makes a correction, depending on the current position of the roller. An independent claim is also included for an electro-hydraulic control unit.