| 摘要 |
1. A string sieve, for classification of loose materials, in particular for mall coal grains, consisting of a rectangular frame, with one side fitted with attach and strain clamps with apertures, and consisting of a set of steel cords supported on transverse supports, characterized in that the set of steel strings (1) is returned on a roller (2) seated rotatably through a distance beam (3) to the attach and strain clamps (7) seated in the apertures (6) of the beam (4), whereas the shaft (2) is locked between the distance beam (3) with the lock beam (5) on the operation direction of forces that stretch the strings (1).<IMAGE>
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