Positive and negative control device for conveying and discharging

The utility model discloses a positive and negative control device for conveying and discharging. According to the positive and negative control device, a 380V three-phase power supply supplies power to a conveyor motor; a primary winding of the control transformer T1 is connected with a 380V three-phase power supply, and a secondary winding of the control transformer T1 outputs a 24V alternating current power supply; a secondary winding of the control transformer T1 is respectively connected with an alternating current contactor KM1 and an alternating current contactor KM2 through a three-gear knob switch; and the three-gear knob switch controls the on-off of the alternating current contactor KM1 and the alternating current contactor KM2 to control the forward rotation and the reverse rotation of the conveyor motor. According to the utility model, the alternating current contactors KM1 and KM2 are arranged to form a self-locking and interlocking circuit, and the three-gear knob switch is used for controlling