... up of the dredging bucket, chain, underwater big arm, upper and lower quadrangled wheel, active power, main ... winch system: it is made up of the big arm lifting winch, bow rope winch, raised anchor winch ... ship and submarine sliding and lifting arm upgrade(Weifang Lingwei Machinery Co.,Ltd)..6. Gantry: it is made ... of catamaran, the rise and fall of underwater arm etc.7.The hull and the hull facilities: ...