Two belt conveyor control circuit

1) Two belt conveyor control circuit
  The circuit is as shown in the figure. The two belts are driven by two asynchronous motors respectively . In order to prevent materials from being blocked on the belt , there are certain sequence requirements
for the start and stop of the belt conveyor
: when starting, the first belt can only start after the first belt starts; when stopping, the second belt can only start when the second belt starts. After stopping, the first belt can stop.