Movable arm scraper collects sludge using track of log spiral, so it has characteristics of good continuity and high efficiency of sludge collection.

One strand: To make the single-strand noodle, the chef first prepares the dough by rolling out a thin log that is then laid flat in a spiral (it somewhat resembles a lollipop).

For single block mechanism, such as plane and log-spiral slip surface, the validity of this method has been verified by a typical two-dimensional example.