Mar 24, 2020 Introduction of sand and gravel production line. The river stones are uniformly sent to the PE600750 jaw crusher by the vibrating feeder for coarse crushing into 65-160mm size. And then the coarsely crushed material is sent to the PSG900 cone crusher by the belt conveyor for secondary crushing into 13-38mm, then is fed into the sand maker for further crushing. Feb 26, 2016 We do not go to the curve which touches the 100 percent ordinate at the 3/4 value we calculate the percentage from the same curve which was used to predict the proportion of minus 0.75 in the crusher discharge. This curve shows approximately 29 percent of minus 3/4 in the material as it comes from the crusher, or 29 tons of fines in ... crusher. 4. METHODOLOGY 4.1 Existing Methods The existing crushers are heavy ones and these crushers are excessively used for crushing materials at big industries and manufacturing plants for crushing cars, stones, metal components, etc., Moreover, these crushers are hydraulically and pneumatically operated and is