Air guide pipeline system of negative pressure type vertical mill and use method of air guide pipeline system

The invention discloses an air guide pipeline system of a negative pressure type vertical mill and a using method of the air guide pipeline system, and belongs to the technical field of air guide pipeline systems of vertical mills. The machine comprises a machine body, a feeding port and a discharging pipe, the feeding port is formed in the side face of the machine body, the discharging pipe penetrates into the machine body from the top end of the machine body, and a slag outlet is further formed in the bottom of the machine body. The negative pressure powder selecting assembly, the grinding roller assembly and the grinding disc assembly are arranged in the machine body, and the negative pressure powder selecting assembly, the grinding roller assembly and the grinding disc assembly are sequentially arranged from top to bottom. The problems that in the existing material grinding process, equipment for pushing edge materials to the middle does not exist, grinding is not fine enough, power equipment is not linke