| 摘要 |
A control system monitors the angle of each ranging arm (42), with respect to the mainframe of the machine. While the machine is in a defined zone along the face, if the angle of the arm (42) is detected to be lower than a parameter defined set-point called the undercut limit, the control system does not allow the arm (42) to be lowered further. When entering the run of face from either gate end, if either of the ranging arms (42) are below the set point, the horizontal movement of the shearer (26) is stopped, and an alarm message is generated, and a warning light begins to flash, alerting the operator that he must raise the arm (42) before horizontal movement of the shearer (26) can be enabled. |
