The ice cream machine you mentioned using the refrigerator is a hard ice cream machine, because the hard ice cream made by the hard ice cream machine must be kept warm in a hard ice display cabinet. Only in this way can we dig up beautiful and delicious hard ice cream with a ball digger. If you want to make ice cream without the refrigerator, you can use a soft ice cream machine. Now it's made and sold, just like in KFC.

Suzhou Fu Guang vertical ice cream machine provides pictures.