Belt Conveyor undercover Dagan method except when what is? What is the problem?

In addition gangue methods:
When the coal face, Lane kick drum machine undercover on the belt conveyor transport routes arrange to pick up the waste rock is then shipped to manually lift the old pond side. Masking tape

Problems:
This method is less labor-intensive large-efficient workers, picking open when Dagan belt conveyor transport, in addition to waste rock is not complete and there are security risks.Wholesale masking tape