vacuum gripper

best starting point would be to not start searching for parts on aliexpress

i like SCHMALZ and FESTO, both offer pretty much every info you need to figure out your component choice

https://www.schmalz.com/en-us/vacuum-technology-for-automation/vacuum-components/vacuum-generators/compact-ejectors/compact-ejectors-scpmb-scpmc-scpmi-307917/10.02.02.06473/

this is an example of what i mean with "every info you need" and what is missing on aliexpress

Quote from javaman

.. How many cups what size how much air flow compressor vacuum generators etc...

Do like Alex nearly already told, you already have the correct order.

First look for the cups, go to a good cups supplier, there you can get the technical data for the cups. So you can calculate the amount and size of cups, then go to venturi supplier....

to size cups you need to consider pressure and area.

F = P/A

pick your units and do the math...

example, atmospheric pressure is 1bar or 1000mbar or 101.3kPa or 14.7lb/in^2...

20kg is some 45lb but you want to add some safety since robot is moving etc. say you double it to 90lb. so if your vacuum generator can draw decent vacuum, you need suction cap that has area of 6in^2 or 1.4in diameter. how is that for sizing?

years ago did a project with KUKA Titan... (1300kg rated robot). it was picking up steel sheets weighing up to 1000kg. several diner plate suctions cups did the job. have pictures somewhere...

I have taught this to robotics students for years. Sizing vacuum components is a complex task because compressed air and vacuum are not linear functions. This is not to be taken lightly if you want to deliver a safe and robust solution.

Every vacuum component supplier that I know will provide an Engineering section of their catalogs for users to make correct calculations. These calculations will provide such important information as maximum lifting force, minimum quantity and size of cups, flow rates, and minimum pipe sizing. Unfortunately, they all seem to calculate the values a little bit differently, which can be confusing. Schmalz, Piab, Camozzi, others all have excellent Engineering resources.

Then after the calculations are made, the task is to select the correct style of cup, cup material, and method of vacuum generation. Finally the end effector structure and piping is designed. The supplier's Technical Support Engineers are there to help navigate the complexity.

Tread carefully laddie, there be beasties and goblins in these woods.