Twin Screw Extruder For New Field

A transmission drive system suitable for a twin screw extruder having a pair of adjacent

parallel axes, the transmission drive system including two adjacent parallel axes putput shafts, each engageable with one of the twin extruder screw and apair of planetary gear trains, each gear train including a ring gear, a plurality of planet gears engaging the ring gear, means rotatively mounting each planet gear about a fixed axis, each planetary gear train further including a sun gear, each planetgear engaging a sun gear, each output shaft extending through the ring gears, each sun gear being mounted for rotation coaxially and non-rotatively with an output shaft, at least two drive pinions engaging the periphery of each ring gear, the drivepinions being equidistantly spaced from one another, separate motor means engaging each drive pinion and means for synchronizing the output speeds of the motor means.

In compendium, the present invention comprises a drive system for a twin screw extruder. The system includes a pair of symmetrically arranged planetary gear sets. Each gear set includes a pair of input pinions and each pinion is independentlydriven by a motor. All motors are electronically speed synchronized. The input pinions engage diametrically opposed portions of a ring gear. The gear sets further include a plurality of planet idler gears which are only rotatable about their axes anda driven sun gear which drives an output shaft. Each planetary gear set is axially displaced from the other planetary gear set, and the output shafts of each extend through a space between the planet gears of the other gear set.

Twin Screw extruders have been employed for various purposes including applications in plastics technologies. Such devices utilized auger screws for transporting as well as extruding the working material. Twin screw extruders included a pair of screws extending along parallel axes relatively close to one another. To assure uniform extrusion flow, the screws were required to be driven both at the same speed. In some instances twin extruder screw were driven in the same direction of rotation, whilein other instances each extruder screw was driven in an opposite direction. This, of course, depended upon the screw configuration. Relatively high torques were required to drive the screws. Such applications

A drive system suitable for driving a twin screw extruder as constructed in accordance with claim 1 further including bearing-free means for supporting the ring gear for rotation about the axis of the sun gear, the bearing-free supportingmeans comprising the engagement between the ring gear and the planet gears.

by: ericfu

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