The invention provides a screw extruder for plasticizing plastic particles, which belongs to the technical field of plastic regeneration
extrusion equipment and comprises a base, a driving unit, a charging
barrel and a screw. Wherein the charging
barrel is provided with a plurality of fixing pipes in the axial direction,
piston pipes capable of sliding in the radial direction of the screw rod are arranged in the fixing pipes, telescopic holes corresponding to the
piston pipes are formed in the charging
barrel, and shearing grooves corresponding to the
piston pipes are formed in the screw rod; and an air pressure cavity is formed in the end, away from the screw rod, of the fixing
pipe. The piston
pipe capable of extending into the screw
pitch of the screw rod is arranged on the charging barrel, air
pressure control is utilized, the pressure is increased, the piston
pipe extends into the screw
pitch of the screw rod, plastic is sheared along with rotation of the screw rod, the piston pipe can improve the radial shearing effect of the plastic in the conveying process, and plasticization of the plastic is more uniform.