Cylinder model selection basis
The output force of the cylinder has nothing to do with the air stroke. It is mainly the cylinder diameter. Once the cylinder diameter is determined, you can find your ideal one corresponding to it. The stroke of the cylinder is gone.
That is to say, 280kg is the condition you gave. According to this condition, the minimum model you need to choose is a cylinder with a bore of 100mm and a working pressure of 0.8MPa. The models are 100*75, 100*100/100*125. . . . . You choose your own itinerary.
The working pressure of the above models is 0.8MPa. Of course, a larger bore is better.