Clutch device between drive device and screw of the plastication unit of an injection moulding machine

摘要

The output piston (10) of the drive device (6) is provided with a clutch housing (11), in which a clutch piston (16) which is spring-loaded in the direction of clutch engagement and can be loaded by a pressure medium in the direction of clutch disengagement is guided. The clutch piston (16) is connected by means of a tappet (18) to a tensioning cage (19). On account of the spring loading of the clutch piston (16) the tensioning cage (19), which is disposed in the radial direction between the clutch housing (11) and a head part (20a) of the screw shaft (21), is deformed in such a manner that it connects the clutch housing (11) and the screw shaft (21) by frictional connection in such a manner that both axial forces and torques can be transmitted from the drive device (6) to the screw (2). By applying pressure medium to the clutch piston (16) in opposition to the spring effect the tensioning cage relaxes and the frictional connection is released, so that the plastication unit (1) can be removed. The clutch device is especially suitable for fully automatic replacement of the plastication unit (1). <IMAGE>