| CPC B07B 1/4645 (2013.01) [B03B 5/48 (2013.01); B07B 2201/04 (2013.01)] | 30 Claims |
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1. A static screening apparatus for separating oversized materials from undersized materials under the force of gravity, comprising:
a first screening module;
a second screening module stacked vertically above the first screening module, wherein each screening module includes:
a first sidewall and a second sidewall spaced from the first sidewall, the first and second sidewalls extending from an inlet end to an outlet end, wherein the outlet end is disposed below the inlet end and wherein at least one of the first sidewall and the second sidewall includes at least one screening bed access opening between its upper edge and its lower edge;
cross-support members disposed between opposing inside surfaces of first and second sidewalls and between upper and lower edges of the first and second sidewalls the cross-support members defining a concave screening bed;
guide members disposed across at least a portion of a distance between opposing inside surfaces of first and second sidewalls; and
a plurality of removable screen assemblies each having a thermoplastic screening surface, wherein the plurality of screen assemblies collectively define a concave screening surface and wherein each screen assembly includes an engagement element to slidably engage at least one guide member when the screen assembly is inserted through the screening bed access opening for disposition between the first and second sidewalls; and
a bottom surface extending between lower edges of the sidewalls, wherein undersized materials passing through the concave screening surface are collected on the bottom surface and exit though a discharge proximate to a lower end of the bottom surface and oversized materials exit over a lower end of the concave screening surface.
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