Polyurethane cantilever bar and sieve plate

The utility model relates to a polyurethane cantilever bar and a sieve plate, which belong to the technical field of bar sieve plates and comprise a cantilever bar body made of polyurethane. The whole cantilever bar body is of a structure with one wide end and the other narrow end, and the cantilever bar body is sequentially divided into a supporting section, an extending section and a screening section from the wide end to the narrow end. The two sides of the supporting section, the two sides of the extending section and the two sides of the screening section are each provided with an inclined first guide face. A supporting framework extending in the length direction of the cantilever bar body is embedded in the cantilever bar body. The structure that the supporting section is gradually narrowed towards the screening section is adopted, the supporting section serves as the fixed end of the cantilever bar body, and meanwhile the supporting strength of the cantilever bar body for resisting material impact is i