| 摘要 |
<p>Method and device for moving a lifting slider of a lifting device, e.g. a lifting slider of a wrapping and packing machine for stretch film wrapping of goods positioned on a loading pallet. The lifting device comprises a lifting slider (6) driven by a hydraulic cylinder (14) through a wire (19), which doubles the movement of the hydraulic cylinder with. The hydraulic cylinder is powered by a hydraulic pump (21) which in turn is powered by the wheels (22) of the lifting device through a link means (25, 26). The hydraulic pump comprises two parallel cylinders (23, 24), which are driven so that always one of the cylinders performs a power stroke. The movements of the lifting slider are controlled by valves for performing a movement upwards, which is proportional to the speed of the lifting device, a blocked position and a lowering with constant speed.</p> |
