alusvedejs said:
a kāpēc vajag 3 ruļļus?
How does the 3-roller work? What is the advantage?
The 3-roller mill has several advantages and few disadvantages. It has greater output than a 2-roller model running at the same RPM. It provides less husk damage, which aids in sparging. Also, the 3-roller mill more fully separates the starch from the husk, while providing superior grain feed, even with wheat. The 3-roller mill's only disadvantages are the additional power requirements to drive it, and the tendency for brewhouse efficiency to be higher than initially expected.
The 3-roller works by pre-crushing the grain in the preliminary gap between the top two rollers, then opening the husk to expose the crushed kernel in the secondary gap with the third roller. The top gap is fixed at approximately .060" which easily pulls in both wheat and barley, softening the starch without tearing up the husk. There are gaps on either side of the third roller between it and the top rollers. The one closest to the driven roller is considered the front of the mill, where most of the grain will be discharged during milling.
As the grain is pressed between the two main rollers, it covers the bottom third roller. The drive roller forces the grain out the front gap, separating the starch from the husk. The grain headed for the tighter rear gap merely drops onto the bottom roller, which delivers it to the front gap. While milling, very little grain will be expelled on the rear side of the mill. It is important to plan for this when designing your base/hopper.
