The working principle of ship unloader is to use continuous conveying machinery to lift bulk materials from the ship's hold and unload them to the conveying system on the shore. Specifically, the ship unloader is usually equipped with a material-retrieving and feeding device, which can continuously lift materials from the ship's hold and unload them onto the boom or rack, and finally transport them to the main conveying system on the shore.
Different types of ship unloaders have different working principles and application scenarios. For example, the portal grab ship unloader has the characteristics of long cantilever and large amplitude. The bulk cargo is unloaded into the funnel through the grab bucket, and then sent to the cargo yard through the belt conveyor. This design makes the unloading efficiency higher, but increasing the lifting and amplitude speed will bring problems of yaw and dynamic load. The screw ship unloader uses a horizontal or vertical screw conveyor to unload bulk cargo through a special material-retrieving device. It is an efficient and continuous bulk cargo unloader.
The advantages and disadvantages of ship unloaders include: the advantage is that it can greatly improve unloading efficiency, reduce dust pollution, and keep the environment clean; the disadvantage is that increasing the lifting and luffing speed will increase the yaw and dynamic load, limiting the speed increase.
Through the description of these working principles and application scenarios, we can better understand the important role of ship unloaders in logistics and transportation.