Abstract:
In view of problems such as roller skidding, belt jumping, belt loosening, material stacking, unbalanced power loads in the middle and head motors, which may occur when driving control of the intermediate unloading belt conveyor is controlled improperly, the paper proposed to use Belt Analyst software to simulate two kinds of driving control scheme of intermediate unloading belt conveyor, and the optimal multi-motor coordination scheme was obtained by comparison: the driver near the main control uses torque tracking, the driver far from the main control uses speed tracking and delay start, and the reasonable delay start condition is that the motor starts when 2% rated speed is detected. In order to reduce dynamic tension of the belt and eliminate the viscoelastic vibration of the belt, control curve and dynamic load of four kinds of speed control modes were analyzed and compared, including uniform acceleration, combined uniform acceleration, combined cycloid and combined parabola.And characteristics which reasonable start-up curve should have were obtained: start-up time is long enough to ensure that the starting acceleration is less than the specified acceleration; starting acceleration is small and there is no mutation since the magnitude of the dynamic tension depends primarily on the maximum acceleration.
