The graphic below shows how material is sorted through these screens. For less fine screening, the throw of the decks will move the material on to the conveyors. For fine screening applications (<6mm), the screens are usually on an incline, so any material that doesn't fall through each tier can tumble onto a conveyor to be carried away. The meshes, or 'screens' are stacked in tiers, and the material dumped on top.Īs the screens shake, smaller material falls through the holes in the mesh, leaving larger pieces on top. Scalping screeners use vibrating meshes to output different sizes of material. 'Scalping' refers to removal of larger pieces of material from the mix, exactly like our sieve. You might also shake your sieve to help the flour work it’s way through the mesh. When you sieve flour you place it into a mesh container so that no clumps of flour can pass through to your mixing bowl. The simplest way to explain how a screening machine works is to think about it as a large sieve. A scalping screen could be used to remove any material that is coarser or finer than these sizes. For example, gravel that will be used in landscaping might require stones that are no bigger than 2 inches, and no smaller than 0.5 inches. The purpose of a scalping screen is to pre-process material for different applications. They work after a crusher or an excavator, which feeds material into the screener for sorting. These machines are at the core of most construction and quarrying operations, and are one of the most used pieces of equipment onsite. A scalper, or scalping screen is a machine used to separate mixed materials into different grades.
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