As a conveying machine, the fully automatic PVC mixing system must understand its working rules. The screw feeder is simple in structure, easy to operate, does not need to be moistened, and has low power consumption; The ore loading amount can be adjusted evenly; Therefore, it has been widely used. It is generally used for loose materials. According to the performance requirements of the fully automatic PVC mixing system equipment, the pressure of materials on the tank body shall be reduced as much as possible during the configuration design. According to the requirements of the manufacturer, the effective discharge port of materials in the bin shall not be greater than one fourth of the width of the tank, and the flow speed of materials shall be controlled within a certain range. For materials with large feeding amount, the ore blocking board with sufficient height shall be set at the discharge place at the bottom of the bin; In order not to affect the performance of the feeder, the ore blocking plate shall not be fixed on the tank. Regularly check whether the clearance of the automatic mixing system changes, whether there is too much dust, and whether the spring plate is broken. The controller of the automatic mixing system shall be placed in a place with little dust, no humidity, no high temperature and good ventilation, and the dust shall be cleaned frequently.