A glass factory in Yuxi uses circular low pressure suction cups to move glass. The circular suction cup is shown in Figure 17 ...... Seek expert to draw the force schematic

As shown above, gravity is not drawn.

The downward upward arrow indicates atmospheric pressure, and the upward downward black arrow also indicates atmospheric pressure, with the up and down black canceling out. The pressure difference is the difference between the atmospheric pressure acting on the area of the suction cup (blue) and the air pressure inside the cup (red), and this difference is balanced by gravity.

So we have: P Outside S - P Inside S = G

Getting: P Outside - P Inside = G/s

Here G is the total weight, which in reality is the pressure difference between the inside and the outside equal to the total weight.