Differential-transmission injection device of miniature injection machine

• Main Authors: WANG JUE, YANG SHIPENG, SHI YOUYOU, SU LIANGYAO, ZHANG BENXI, XU ZHONGBIN, ZHOU JUDONG, HUANG QINGDA, LIU GUOLIN
• Format: Patent
• Language: Chinese; English
• Published: 29.01.2014
• 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 differential-transmission injection device of a miniature injection machine. The device comprises an injection servomotor, a threaded sleeve, a driving nut, a driven screw, an injection plunger piston, a metering and adjusting device and a preplasticator, wherein the driving nut is fixedly connected together with a machine frame, and the injection servomotor is connected with the threaded sleeve to directly drive the threaded sleeve to rotate; the external thread of the threaded sleeve is matched with the driving nut to form a master screw pair, and the internal thread of the threaded sleeve is matched with the driven screw to form a slave screw pair; the master screw pair and the slave master screw pair are connected in series and superimposed to form a differential screw mechanism, and the screw difference between the two screw pairs is the differential distance generated by rotating the threaded sleeve by a turn. The device solves the problem of difficulty in controlling the t