Stockpile portal discharge scraper - has reciprocating auxiliary scraper rake driven from derricking main scraper rake

摘要

The portal carries a derricking main scraper, to the free end of which an auxiliary scraper of the reciprocating rake type is fastened its other end working in a guide in the portal, and which feeds material to the main one. The auxiliary scrper is driven from the working parts of the main one. It can be ladder-shaped, with a series of rakes secured to its lengthwise members, the rakes increasing in size in the direction of working, while the members diverge in this direction. Drive to the auxiliary scraper can be by an adjustable eccentric mechanism.