The grab ship unloaders with a capacity of 500t/h~3000t/h designed and manufactured by CNBM are suitable for unloading the bulk materials, e.g. ore, coal, etc. from the bulk ships and barges of 3,000 dwt ~400,000 dwt at the bulk cargo terminals. The ship unloaders are advanced in technology, perfect in performance, reliable in operation, favorable in stability, efficient in unloading, long in service life, convenient for maintenance and can meet the needs for high freight volume, high-efficiency and frequent operation. The level of noise and dust produced by the ship unloaders during operation is low and conforms to the national environment protection standards.