Different-diameter extrusion screw of cold-feed exhausting extruder

• Main Authors: CHEN JIE, HUANG FAGUO
• Format: Patent
• Language: Chinese; English
• Published: 13.02.2013
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The utility model discloses a different-diameter extrusion screw of a cold-feed exhausting extruder. The different-diameter extrusion screw of the cold-feed exhausting extruder comprises a double-stage screw or a multi-stage screw, wherein the outer diameters of screw threads of a working section comprising the double-stage screw or the multi-stage screw vary by stages so as to achieve capacity balance. The screw can be in an integrated structure or a split type structure, the stages are connected in screwing mode through screw threads, positioning sections which are used to guarantee coaxiality of the outer diameters of each two adjacent stages of the screw are designed, and an axial seal method and an end face seal method are combined to guarantee sealing performance. A screw head is connected to a screw body at a measuring section position in welded mode or through screw threads, and a bigger water way is machined on the screw body at the measuring section position. According to the different-diameter extr