Device for moving in the longitudinal direction a screw shaft for mixing machines and mixing machine equipped with said device

摘要

Device for moving in the longitudinal direction (X-X) a shaft (120;1120;2120) with screw (121) rotationally driven by a motor (140;2140), comprising at least one cylinder (100;1100;2100) coaxial with said shaft (120;1120;2120) and provided with at least one rotating piston (131;1131;2131) rigidly connected to the shaft (120;1120;2120) and able to produce a displacement in either direction of the shaft (120;1120;2120) from a first retracted end-of-travel position into a second advanced end-of-travel position, and vice versa.