The invention discloses a two-
screw pump and a preparation method of rubber lined screw rods of the two-
screw pump. The two-
screw pump comprises a pump body, a pump
front cover, a pump rear cover, a driving screw rod and a driven screw rod, wherein the driving screw rod and the driven screw rod are arranged in the pump body and meshed with each other; the pump body adopts such a transmission manner that liquid inlets are formed in two ends of the pump body and a liquid outlet is formed in the middle of the pump body; the surface of the driving screw rod as well as that of the driven screw rod is lined with a layer of rubber. The preparation method comprises the following steps: conducting de-oiling and sand-blast treatment on the outer surfaces of the screw rods;
coating the outer surfaces of the screw rods with a layer of an
adhesive after cleaning and
drying; placing the screw rods coated with the
adhesive into a screw rod mold for rubber injection; performing
vulcanization molding in a large-scale rubber
vulcanization tank; opening the screw rod mold after cooling, so that the required rubber lined screw rods are obtained. The surfaces of the driving screw rod and the driven screw rod are lined with the
layers of rubber in such a manner of local rubber injection and local air
discharge, so that the preparation method is simple and easy to operate, the rubber injection difficulty is reduced, and the quality of a rubber body is also guaranteed; the two-screw pump is resistant to abrasion, high in sealing performance and long in service life, and the medium through capability can be effectively improved.