초록 ▼

The material-processing machine comprises at least a screw (11) driven in rotation inside a sleeve (1) and constituted by a central driving shaft (2) on which are mounted a plurality of screw elements (3) forming a stack of adjoining elements clamped between an abutment and clamping means placed res

The material-processing machine comprises at least a screw (11) driven in rotation inside a sleeve (1) and constituted by a central driving shaft (2) on which are mounted a plurality of screw elements (3) forming a stack of adjoining elements clamped between an abutment and clamping means placed respectively at the two ends of the shaft (2). The clamping means (4, 5) are arranged in such manner as to exert on the stack of screw elements (3) a prestressing force capable of opposing the separation of the screw elements (3) from each other in operation of the machine. The invention is especially applicable to the construction of screw extruders.

대표청구항 ▼

A material-processing screw machine comprising a sleeve, at least one screw inside the sleeve, means for driving the screw in rotation, the screw including a central driving shaft, a plurality of screw elements mounted on the shaft and a sealing gasket interposed between the screw elements, the scre

A material-processing screw machine comprising a sleeve, at least one screw inside the sleeve, means for driving the screw in rotation, the screw including a central driving shaft, a plurality of screw elements mounted on the shaft and a sealing gasket interposed between the screw elements, the screw elements and gaskets forming a stack of adjoining elements, an abutment placed at one end of the shaft and clamping means placed at an opposite end of the shaft, said clamping means being capable of exerting on the stack of elements a pre-stressing force capable of opposing separation of the screw elements from each other in operation of the machine, said clamping means comprising a hydraulic jack including two members consisting of a piston and a cylindrical body in which the piston is movable, one of said two members bearing against the central shaft and the other of said two members bearing against the stack, and means for mechanically locking the piston relative to the body of the jack after the stack has been pre-stressed.