The invention relates to a greenhouse (GH) comprising a shielding installation with at least one screen (S) that is moveable between a non-shielding position and a shielding position. The screen driving system being configured for moving the at least one screen and comprising: -a driving axle(DA) -a winding drum (WD) on the driving axle -a cable (CA) extending between the winding drum and the at least one screen and -an actuator (AC) for driving the driving axle. The winding drum comprises a spiral groove for receiving the wound cable in the spiral groove on the winding drum to support the cable and to separate the windings on the winding drum, and the winding drum comprises at least two shell parts partially surrounding the driving axle and comprising connectors to connect the shell parts together.
