Patent ID: 8596856

Claim:
A counter-rotating twin screw extruder, at least comprising: a casing barrel, which is mounted on a frame and has a feeder and a plurality of heating holes formed at one side thereof, the casing barrel having an end that forms an outlet; two screw shafts, which are arranged in a symmetric manner to extend through the outlet of the casing barrel, each screw shaft comprising one section of screw, the screws of the screw shafts comprising screw flights that are arranged in opposite directions; a motor, which is arranged to supply power, directly or indirectly, to the two screw shafts; characterized in that: a gear box and a bearing box, which are independent of each other and are arranged in transmission between the motor and the screw shafts, the gear box having an end provided with an input spindle coupled to the motor and an opposite end that is coupled, after through speed reduction with a plurality of gears, to two output spindles for rotations in opposite directions and to further extend the bearing box to respectively coupled to the two screw shafts, the bearing box containing therein a plurality of bearings and providing vibration protection for the shafts; and a flow restriction die, which is set inside the casing barrel, the flow restriction die forming two symmetrically arranged supporting holes and a plurality of openings distributed around the supporting holes, wherein the shafts respectively extend through the support holes.