ZKS series vacuum feeding machine is used in vortex pump suction, the suction nozzle inlet and the whole system is in a negative pressure state of the powder pellets with outside air is sucked into the nozzle, the formation of the material flow, through the suction tube to the hopper, the hopper material in gas separation. After the separation of the material into the receiving equipment. Feeding and discharging through the pneumatic valve to open and close to complete, and the pneumatic reversing valve opening and closing is controlled by the control center.