| 摘要 |
<p>Screening apparatus for aggregates or the like has a sieve screen comprising a plurality of sieve elements secured to a support frame of moulded synthetic plastics material, each element having a lug formed by an undercut peripheral depending skirt engaging a corresponding recessed sidewall of a groove in the frame. A support frame for such a sieve screen may be in the form of a lattice moulded from synthetic plastics material, preferably have cross members so spaced that each aperture of lattice will be obscured by a different one of the plurality of sieve elements. The frame may have a plurality of attachment bars projecting at intervals from the undersurface thereof and be supported in the apparatus by a plurality of spaced support bars, each bar having, at intervals along its length corresponding to the spacing of the attachment bars, apertures of a shape to receive said bars.</p> |
