The screen is a machine used in quarries and mines to filter aggregates after they have passed through the crusher.
The main element of a screen is the sieve grid, the mesh of which can be adjusted to achieve different grain sizes. The size of the grid determines the screening area. The throughput of the screen is measured in tonnes per hour.
A distinction is made between vibrating screens and scalping screens. The vibrating screen has several stages, that is to say several separating grids. The vibrations cause the smallest elements to fall onto the lower grids, with the bottom grate being the final step with the smallest grain size. The scalper intervenes upstream of the crushing to carry out a first operation of separating the aggregates.
There are mobile screens, most often equipped with caterpillars, which can move on construction sites.
On Europe-Construction-Equipment.com, see the ads for used screens: Powerscreen, Keestrack, Metso, Finlay, Sandvik, Chauvin.