|
One could imagine that it is the same thing as a vacuum cleaner sucking up dust. But in fact a vacuum cleaner pushes dust into it by creating a negative pressure inside the vacuum cleaner and the higher ambient (outside it) pressure pushes the dust into it. The suction cup operating principle is very similar. The suction cup on the surface of the part to be carried is sealed against the outside ambient (also called atmospheric) pressure. The pressure inside the suction cup becomes negative (lower than ambient) as air is drawn out of it. The part is firmly pressed onto the suction cup by the atmospheric pressure. To draw the air out of suction cups, vacuum pumps or air ejectors are used that thus generate that negative pressure inside them. The lower the pressure inside the suction cup the heavier the object to be carried can be. |
|
How does a vacuum suction cup work ?