A combination of pins and holes will get you roughly sized items.
A vibrating table with lots of W snapped channels underneath is going to help too.
A belt with "scoops" is a great way to feed out of your initial hopper, if you drop it onto a perpendicular belt (one with W grooves) your going to get a good initial separation more naturally.
Air knives and puffers are your friend as well. Since you already have a detection system running it twice might be of benefit to you, just puff off anything that you can't sort as a single item.
I don't think "quite" and "lego" really go together so no happy solution for you there other than sound isolation.
A combination of pins and holes will get you roughly sized items.
A vibrating table with lots of W snapped channels underneath is going to help too.
A belt with "scoops" is a great way to feed out of your initial hopper, if you drop it onto a perpendicular belt (one with W grooves) your going to get a good initial separation more naturally.
Air knives and puffers are your friend as well. Since you already have a detection system running it twice might be of benefit to you, just puff off anything that you can't sort as a single item.
I don't think "quite" and "lego" really go together so no happy solution for you there other than sound isolation.