Semi-automatic lifting/lowering mechanism

The utility model relates to a semi-automatic lift mechanism, comprising a platform, two opposite-arranged parallelogram mechanisms, two support arms, two cylinders, a hydraulic control device, an electrical control device and a platform locking mechanism for fixing the plane board when the platform is folded; the two ends of a hydraulic cylinder are connected to the hinging connection at the ends of the two diagonals of the parallelogram mechanisms; the upper end of the support arm is fixed on the connection board; the fore part of the platform is hinged to the lower part of the support arm. The utility model is of compact structure; convenient, safe, stable and reliable operation, and the utility model can bring convenience for unloading, no labor is used, meanwhile, the unloading process is of no vibration, no good damage can be caused; the mechanism can be used to load people, in particular used for inconvenient people to get on automobile.