ORE PASS Russian patent published in 2006 - IPC E21C41/00 

FIELD: mining engineering, particularly for underground mining.

SUBSTANCE: ore pass comprises shaft, loading mouth with sieve installed in the mouth, conveyer belts and discharge means. Conveyer belts are connected to the sieve and spaced from ore pass walls. Elastic sealed shells filled with compressed air are fastened to one conveyer belt along conveyer belt length. Located above the shells are protective shields. Minimal distance between conveyer belt and elastic sealed shells is equal to maximal ore piece diameter. Distance h between adjacent elastic sealed shells may be determined from the following mathematical expression: h=d_o+12, where d_o is medium ore piece diameter, m. The elastic sealed shells may be formed of rubber cord. Elastic sealed shells may be shaped as pillows, balls or toroids.

EFFECT: increased product quality due to decreased rock reduction ratio.

3 cl, 2 dwg