... up of the dredging bucket, chain, underwater big arm, upper and lower quadrangled wheel, active power, ... gold selecting combinational chute and bucket, gold washing machine (roughing device), jig (cleaning equipment),it is ... system: it is made up of the big arm lifting winch, bow rope winch, raised anchor winch ... ship, mooring ship and submarine sliding and lifting arm upgrade.6. Gantry: it is made up ...