A single screw extruder drive has a housing
A single screw extruder drive has a housing, at least two extrusion worms each having a drive shaft extending into the housing, and at least twin screw extruder drive motor including at least one cylindrical stator fixed in the housing and a cylindrical rotor cooperating with the stator so as to be rotatably driven by the stator. The rotor surrounds the drive shafts, and each of the drive shafts is independently connected to the rotor for driving thereby.
According to a feature of the sheet production sextruder, the extruder drive comprises a drive housing and at least one drive motor with a stator and rotor. Each of the two extruder worms has a connecting shaft at least partly encompassed within the drive housing. In the drive housing there is at least one cylindrical stator and this stator surrounds a cylindrical rotor. The two extruder worms with their connecting shafts are independently connected with the rotor, but out of direct contact with each other. As has already been indicated in the preferred embodiment, the apparatus is a double-worm extruder.
According to a preferred embodiment of the invention a cylindrical stator is mounted in the drive housing and surrounds a single cylindrical rotor that in turn is connected with both of the connecting shafts of the two extruder screws or worms. It is possible in accordance with the invention that the rotor is directly connected to one shaft or at least one shaft, i.e. without the interposition of further elements.
According to another preferred embodiment of the invention two cylindrical stators are provided in the drive housing and each stator surrounds a cylindrical rotor. Each of the cylindrical rotors is connected with the connection shaft of one of the two worms or screws. According to a first embodiment of this mode of the invention, each of the cylindrical rotors is directly connected with the connection shaft of the associated worm or screw. The term “direct” here refers to the absence of an intervening gear or member between the connection shaft and the internally toothed rotor. In this first embodiment of this mode of the twin screw extruder, advantageously the two drive motors with their respective rotor and stators are offset from one another with respect to the longitudinal direction or transversely in order to provide an especially compact construction. Correspondingly one of the mesh shafts can be longer than the single screw extruder.