Greenhouse outward turning type lower ventilation system and control method

The greenhouse outward-turning type lower ventilation system comprises a ventilation opening and a window arranged on the ventilation opening, the upper end of the window is hinged to a greenhouse, and the greenhouse outward-turning type lower ventilation system further comprises a driving device for driving the window to swing up and down to achieve opening and closing. The driving device comprises two pulleys, a steel wire rope annularly bypassing the two pulleys and a steel wire rope driving mechanism for driving the steel wire rope to move, the steel wire rope driving mechanism comprises a winding drum and a motor for driving the winding drum to rotate, the steel wire rope bypasses the winding drum, and the two pulleys are arranged in the length direction of the ventilation opening; the driving mechanism further comprises a plurality of sliding blocks slidably connected to the guide rails in the moving direction of the steel wire ropes, the sliding blocks are connected with the windows through supporting