Raw material mixing device and mixing method for PVC (polyvinyl chloride) production

The invention relates to the technical field of PVC mixing, in particular to a raw material mixing device for PVC production and a mixing method.The raw material mixing device comprises a mixing cylinder and a rotating shaft rotationally inserted in the mixing cylinder, an outer mixing sleeve is rotationally installed outside the mixing cylinder, and a connecting sleeve is jointly and fixedly connected between the outer mixing sleeve and the rotating shaft; a spiral driving plate is fixedly mounted in the outer mixing sleeve, the spiral driving plate is tightly attached to the outer wall of the mixing barrel, and an inlet groove and an outlet groove are uniformly formed in the top and the bottom of the mixing barrel respectively. The PVC raw materials are mixed in the spiral driving plate between the mixing barrel and the outer mixing sleeve, the PVC raw materials are stirred by the vibration stirring assembly, the mixing efficiency can be improved, the spiral driving plate can bring the PVC raw materials to