回転寿司で、皿が回ってるって英語でなんて言うの？

Kaiten-zushi is a sushi restaurant where the plates with the sushi are placed on a rotating conveyor belt. This is also sometimes called 'sushi-go-round.'
Eg "Hey, would you like to go downtown to a kaiten zushi this evening?'
"Sure, I just love the way the food is carried around the restaurant on that moving belt!"

Example sentences:
The dishes sit on a conveyor belt that run through the restaurant at the Kaiten Zushi.
The dishes sit on a rotating belt at the Kaiten Zushi so that customers can choose what they want to eat.
At a Kaiten Zushi, the dishes are placed on a moving conveyor belt and customers can easily pick what they want to eat.

At a 'Keiten Zushi' restaurant the sushi plates are delivered to each customer in their seat using a conveyor/rotating belt meaning they don't have to get up to get their food they can pick and choose what dishes they want from the belt that moves around them/in front of them

The idea of a "conveyor belt" is central to the idea of kaiten zushi so I used it in all of my responses. All three of these sentences will explain the idea to someone who has never been to a restaurant of this type.

It is very common in Australia to refer to this as a Sushi Train. We quite often will say "Let's go to the Sushi Train for lunch." Practically everyone knows what you are talking about. The reason we refer to it as a Sushi Train is that it moves on a circular track with plates of sushi up for selection. There is resemblance to a Train other than the fact that the Sushi or various Japanese dishes move around in a circular motion much like old train kits once did. :)

A Kaiten Zushi is a conveyor belt that delivers sushi to each customer- This statement is saying that the conveyor belt gives each customer their order of food by using technology.