A sweep system for moving particulate matter in a bin having a bin floor may comprise a sweep apparatus having at least two branches. In some implementations, the logarithmic convexity of a probability function is determined. The first and second filtering elements define the chamber. 0 mm, and a surface hardness of the intermediate layer is higher than the central point hardness of the center by 20 to 50, and the hardness difference between the cover hardness and the surface hardness of the intermediate layer is within the range of 0 to 12. Various features for increasing the strength and durability of the bracket are also disclosed.