Abstract: A gravity flow apparatus that scalps off the large pieces of foreign material from grain before processing or storage. The scalper consists of an upright housing with a grain inlet at the top. The grain enters the housing and drops onto a dead head slide. The dead head slide with a flexible baffle slows the momentum of the falling grain then spreads the grain out over the slide width before it enters the screen. The slide is sloped to suit the grain's natural angle of repose and is lined with an anti-friction material for mass flow. The grain enters the full width of the screen while a second baffle stops grain from freely pouring into the foreign material discharge. The screen is adjustable to allow the grain to spread on the screen at its natural angle of repose while trash is scalped off over the screen into the trash discharge.

Abstract: A hammermill having a polygon profile screen which provides for improved hammer impact and crushing efficiency. Particles in the working zone of the hammermill tend to be accelerated in the direction of hammer rotation. This acceleration lessens the speed differential between the hammer and the particle, which lessens the impact force and crushing efficiency. The polygonal screen inhibits this acceleration of particles in the working zone, due to flow interruptions caused by its irregular shape, thus increasing the particle-to-hammer speed differential and crushing efficiency.